BDOS.s

12640		;OUP/M BDOS WRITTEN BY SHAO, JIAN - XIONG
12650		;ERROR NO. LISTING
12660		;$02 DISK NO. TOO LARGE
12670		;$03 FUNCTION NO. TOO LARGE
12680		;$04 DISK WRITING PROTECTION
12690		;$05 DUPLICTED FILE WHEN MAKE FILE
12700		;$06 CHECK AREA NOT MATCH
12710		;$07 FILE WRITING PROTECTION
12720		;$08 FILE NOT OPEN
12730		*=$D93A
12740		START=$00						;WARM BOOT ADDR. 
12750		IOBYTE=$03						;I/O BYTE
12760		CREG=$08						;WORK STORAGE
12770		DEREG=$09
12780		HLREG=$08
12790		HLREG1=$0D
12800		USERSP=$10
12810		RTNFLG=$18						;RETURN FLAG
12820		TEMP=$1F
12830		CDTDRN=$25						;'DR' RESERVATION
12840		SCNPTS=$38						;SCREEN LINE START POINTER
12850		CHRNUB=$3E						;CHAR. NOS IN INPUT BUFFER
12860		CSBUFS=$3F						;OFFSET OF LAST CHAR TO
12870										;STARING ADDRESS OF THE BUFFER
12880		COUNT=$3D
12890		BRHTAB=$DBC3					;BDOS
12900		ADCOFS=$DC80
12910		STRTFG=$DFDA
12920		RETURN=$E3D8
12930		R$TURN=$E3EE
12940		WBOOT=$E477						;BIOS
12950		CSLTET=$E560
12960		CLINN=$E57A
12970		CLOUTT=$E591
12980		LITOUT=$E5A9
12990		ERROR=$E928
13000		BANBAC	.BYTE$00				;NO. COUNTER OF BACK SPACE
13010		PRTFLG	.BYTE$00				;PRINTER ON/OFF FLAG
13020		SCNPNT	.BYTE$00				;SCREEN LINE COUNTER
13030		PRECHR	.BYTE$00				;PREVIOUS CHARACTER
13040		WMBCOT	.BYTE$2D				;
13050	;
13060		BDOS=*
13070	;
13080		STX	CREG						;STORE PARAMETERS
13090		STA	DEREG	
13100		STY	DEREG+1	
13110		LDA	#$00						;INIT. SOME LOCATIONS FOR
13120		STA	CRTDRN						;RETURN ROUTINE
13130		STA	RTNFLG
13140		STA	RTNFLG+1
13150		STA	RTNFLG+2
13160		LDA	#RETURN-1/256
13170		PHA								;SET RETURN ROUTINE ADDR. 
13180		LDA	#RETURN-1
13190		PHA
13200		LDA	CREG				;CHECK FUNCTION NO. LEGALITY
13210		CMP	#$29
13220		BCC	B$0S
13230		LDA	#$03				;IF ILLEGAL, ERR!
13240		JMP	ERROR
13250		B$OS=*
13260		ASL	A
13270		LDX	#BRHTAB				;ADDRESS FROM BRHTAB
13280		STX	HLREG
13290		LDX	#BRHTAB/256
13300		STX	HLREG+1
13310		LDY	#$00
13320		STY	TEMP
13330		JSR	ADCOFS
13340		LDA	(HLREG),Y
13350		STA	HLREG1
13360		INY
13370		LDA	(HLREG),Y
13380		STA	HLREG1+1
13390		LDA	DEREG
13400		JHP	(HLREG1)				;JMPE TO DESIRED ROUTINE
13410		REV1*=*+40
13420	;
13430	;******************************************************
13440	;*
13450	;*	FUNCTION 0 : SYSTEM RESET
13460	;*
13470	;********************************************************
13480	;*
13490	;*	ENTRY PARAMETERS :
13500	;*		REGISTER X : $00
13510	;*
13520	;*******************************************************
13530	;	
13540		SYMRST=*
13550	;
13560		JMP	WBOOT;
13570	;
13580		INCHR=*					;GET A CHARACTER FROM CONSOLE
13590	;
13600		LDA	PRECHR
13610		BEQ	I$CHR
13620		LDX	#$00
13630		STX	PRECHR
13640		RTS
13650		I$CHR=*
13660		LDX	#$00
13670		STX	PRECHR
13680		JMP	CLINK
13690		RESV2*=*+4
13700	;
13710	;*****************************************************
13720	;*
13730	;*	FUNCTION 1 : CONSOLE INPUT
13740	;*
13750	;*****************************************************
13760	;*
13770	;*	ENTRY PARAMETERS :
13780	;*		REGISTER X : $01
13790	;*
13800	;*	RETURNED VALUE :
13810	;*		REGISTER A : ASCII CHARACTER
13820	;*
13830	;***************************************************
13840	;
13850		CSLIN=*
13860	;
13870		JSR	INCHR							;GET A CHAR FROM CONSOLE
13880		JSR	C$LIN							;HANDLING CONTROL CHARACTER
13890		BCC	CS$IN							;IF CONTROL CHAR EXCEPT
13900											;'CR','LF','BA','TAB',THEN RETURN
13910		PHA
13920		JSR	CSLOUT
13930		PLA
13940		CS$IN=*
13950		JMP	STRTFG
13960		C$LIN=*
13970		CMP	#$011							;'CR'?
13980		BNE	CSLIN1							
13990		RTS									
14000		CSLIN1=*
14010		CMP	#$0A							;'LF'?
14020		BNE	CSLIN2							
14030		RTS
14040		CSLIN2=*
14050		CMP	#$09							;'TAB'?
14060		BNE	CSLIN3
14070		RTS
14080		CSLIN3=*
14090		CMP	#$08							;'BA'?
14100		BNE	CSLIN4
14110		RTS
14120		CSLIN4=*
14130		CMP	#$20
14140		RTS
14150		;
14160		INTPHD=*							;INTERUPTING CHAR HANDLING
14170		;
14180		LDA	PRECHR							;CHECK IF THERE IS A PREVIOUS CHAR
14190		BNE	INTPH$
14200		JSR	CSLTET							;TEST IF CONSOLE IS READY
14210		AND	#$01
14220		BEQ	I$TPHD
14230		JSR	CLINN							;IF READY,READ A CHAR.
14240		CMP	#$13						;CONTROL-S?
14250		SHE	IN%PHD
14260		INT$HD=*
14270		JSR	CLINN						;IF IT IS CONTROL-S,WAIT UNTIL NEXT
14280										;CHAR COMING IN.
14290		CMP	#$03						;CONTROL-C?
14300		SHE	INTP$D
14310		JMP	$0000						;IF IS,TO WARM BOOT
14320		INTP$B=.
14330		LDA	$00							;IF ANOTHER CHARACTER,RETURN
14340		RTS
14350		INSPHD=*
14360		STA	PRECHR						;WHEN FIRST RENDING IS NOT CTRL-S
14370										;STORE IT TO PREV. CHAR. LOCATION
14380		INTPH$=*
14390		LDA	IBFF
14400		ISTPHD=*
14410		RTS
14420	;
14430		OUTCHR=*						;OUTPUT A CHARACTER
14440	;
14450		PHA
14460		LDA	BANBAC						;TO SEE IF THIS IS FROMN 'BA'
14470		SHE	OSTCHR						;IF IS,NOT OUTPUT TO CSL
14480		JSR	INTPHD						;HANDLING INTERUPTING CHAR.
14490		PLA	
14500		PHA	
14510		JSR	CLOUTT						;OUTPUT TIS CHAR TO CONSOLE
14520		PLA
14530		PHA		
14540		LDX	PRTFLG						;TO SEE IF PRINTER	
14550		BEQ	OSTCHR	
14560		JSR	LITOUT						;IF ON,ALSO SENT TO PRINTER.
14570		OSTCHR=*
14580		PLA
14590		CMP	#$7F						;IF IS 'DEL' ,RETURN,THAT IS, NOT
14600										;INCREASING SCNPNT
14610		BNE	OUSCHR
14620		RTS
14630		OUSCHR=*
14640		INC	SCNPNT						;IF IT LESS THAN $7F, GREATER THEN
14650										;EQUALTO $20, SCNPNT INCREASED
14660										;BY 1
14670		CMP	#$20
14680		BCC	OUT$HR
14690		RTS
14700		OUT$HR=*
14710		DEC	SCNPNT						;IF IT IS CTRL CHAR.,THAT IS, LESS
14720										;THAN $20
14730		LDX	SCNPNT						;THEN, NOTCHANGE SCNPNT
14740		BNE	OUTC$R
14750		RTS
14760		OUTC$R=*
14770		CMP	#$08						;IF IS 'BA',SCNPNT DECREASED BY 1
14780		ONE	OUTCH$
14790		DEC	SCNPNT
14800		RTS
14810		OUTCH$=*
14820		CMP	#$0A			;IF IS 'LF',SCNPNT SHOULD BE SET
14830							;TO ZERO
14840		ONE	OUTC$$
14850		LDA	#$00
14860		STA	SCNPNT
14870		OUTC$$=1
14880		RTS
14890		CSLOU$=*
14900		JSR	C$LIN			;DISTINGUISH CTRL & NO-CTRL CHAR
14910		BCS	CSLOUT			;EXCEPT 'CR','LF','BA','TAB'
14920		PHA
14930		LDA	#$5E			;IF CTRL CHAR, OUTPUT '~', FOLLOWED
14940							;BY A CHAR CORRES, THIS DESIRED
14950							;CONTROL CHARACTER
14960		JSR	OUTCHR
14970		PLA
14980		ORA	#$40
14990	;
15000	;*******************************************************
15010	;* 
15020	;*	FUNCTION 2 : CONSOLE OUTPUT *
15030	;* 
15040	;********************************************************
15050	;*
15060	;*	ENTRY PARAMETERS :
15070	;*		REGISTER X : $02 
15080	;*		REGISTER A : ASCII CHARACTER
15090	;*
15100	;*******************************************************
15110	;
15120		CSLOUT=*
15130	;
15140		CMP	#$09				;CHECK FOR 'TAB'
15150		BEQ	C$LOUT
15160		JMP	OUTCHR
15170		CLOUT=*
15180		LDA	#$20				;IF IS 'TAB',OUTPUT SOME SPACE TO
15190		JSR	OUTCHR				;FIT THE NEEDS OF THE 'TAB'
15200		LDA	SCNPNT
15210		AND	#$07
15220		ONE	C$LOUT
15230		RTS
15240		RESV*=*+1
15250	;
15260	;
15270	;
15280	;
15290	;
15300	;
15310	;
15320	;*****************************************************
15330	;*
15340	;* 	FUNCTION 3 : LIST OUTPUT
15350	;*
15360	;******************************************************
15370	;*
15380	;*	ENTRY PARAMETERS :
15390	;*		REGISTER X : $03
15400	;******************************************************
15410	;
15420		LITOTT=*
15430	;
15440		JMP	LITOUT
15450	;
15460	;*******************************************************
15470	;*
15480	;* 	FUNCTION 4 : DIRECT CONSOLE I/0
15490	;*
15500	;********************************************************
15510	;*
15520	;*	ENTRY PARAMETERS :
15530	;*		REGISTER X	: $04
15540	;*		REGISTER A	: $FF (INPUT) OR CHAR(OUTPUT)
15550	;*	
15560	;*	RETURNED VALUE :
15570	;*		REGISTER A : CHARACTER OR STATUS
15580	;*
15590	;*******************************************************
15600	;
15610		DRCSIO=*
15620	;
15630		TAX				
15640		INX							;CHECK FOR INPUT OR OUTPUT 
15650		BEQ	D$CSIO					
15660		JMP	CLOUTT					;OUTPUT THIS CHARACTER
15670		D$CSIO=*					
15680		JSR	CSLTET					;TEST IF CONSOLE IS READY INPUT
15690		AND	#$01					
15700		BEQ	DR$SIO					;IF NOT READY,RETURN 
15710		JSR	CLINN					;INPUT A CHARACTER
15720		DR$SIO=*		
15730		JMP	STRTFG		
15740		REESV*=*+3		
15750	;
15760	;
15770	;
15780	;
15790	;
15800	;
15810	;
15820	;
15830	;
15840	;
15850	;
15860	;******************************************************** 
15870	;*
15880	;* FUNCTION 5 : BUFFER OUTPUT
15890	;*
15900	;********************************************************
15910	;*
15920	;*	ENTRY PARAMETERS :
15930	;*		REGISTER X : $05
15940	;*		REGISTER Y,A : STARTING ADDRESS OF THE BUFFER 
15950	;*
15960	;******************************************************
15970	;
15980		OUTBUF=*
15990	;
16000		LDY	#$00
16010		OU$BUF=*
16020		LDA (DEREG),Y
16030		CMP	#$24						;'$'?
16040		BNE	O$TBUF						;IF IS,END
16050		RTS					
16060		O$TBUF=*			
16070		JSR CSLOUT						;IF NOT,OUTPUT THIS CHARACTER UNTIL 
16080										;$ IS MET.
16090		INY					
16100		BNE	OU$BUF				
16110		INC	DEREG+1				
16120		BNE	OU$BU				
16130	;						
16140		BKSPAC=*						;BACK SPACE ONE CHARACTER
16150	;					
16160		JSR B$SPAC			
16170		LDA 11,20			
16180		JSR CLOUTT			
16190		B$SPAC=*			
16200		LDA	#$08			
16210		JMP CLOUTT			
16220	;					
16230		NWLNHD=*						;POSITION CURSOR TO THE LOCA. OF NEW
16240										;LINE CORRESPONDING TO THE ORIGINAL 
16250										;POSITION IN CURRENT LINE
16260		LDA	#$23						;OUTPUT # TO ENDED CURRENT LINE
16270		JSR OUTCHR	
16280		JSR CRLFHD						;CURSOR TO A NEW LINE	
16290		NW$NHD=*	
16300		LDA SCNPNT						;POSITION CURSOR TO THE LOCA.		
16310										;CORRESPONDING THE ORIGINAL ONE
16320		CMP SCNPTS	
16330		BCC N$LNHD	
16340		RTS	
16350		N$LNHD=*	
16360		LDA	#$20	
16370		JSR OUTCHR	
16380		JMP NW$NHD	
16390	;
16400		CRLFH11=*:				;CR AND LF HANDLING
16410	;
16420		LDA	#$011
16430		JSR	OUTCHR
16440		LDA	#$0A
16450		JMP	OUTCHR
16460	;
16470	;*******************************************************
16480	;*
16490	;*	FUNCTION 6 : READ CONSOLE BUFFER
16500	;*
16510	;*******************************************************
16520	;*
16530	;*	ENTRY PARAMETERS ;
16540	;*			REGISTER X ;	$06
16550	;*			REGISTER Y,A:	STARTING ADDRESS OF THIS BUFFER *
16560	;*
16570	;* RETURNED VALUE :
16580	;* 		CONSOLE CHARACTERS IN THE BUFFER
16590	;*
16600	;*******************************************************
16610	;
16620		RDCSBF=*
16630	;
16640		CLD
16650		LDA	SCNPNT					;STORE THE INIT VALUE OF SCREEN
16660									;LINE POINTER TO SCREEN STAR POINTER 
16670		STA	SCNPTS	
16680		LDA	#$00	
16690		LDY	#$01	
16700		STA	CHRNUB					;KEEP COUNTER OF CURRENT CHAR.S
16710		STY	CSBUFS					;AND OFFSET OF THE LAST CHAR TO START
16720									;ADDRESS OFTHEBUFFER.
16730		RD$SBF=*	
16740		JSR INCHR					;GET A CHARACTER
16750		AND	#$7F	
16760		CMP	#30D					;'CR'? 
16770		BEQ	RD$$$F	
16780		CMP	#$0A					;'LF'?
16790		BNE	RDC$$$	
16800		RD$$$F=*
16810		JMP RDC$$F
16820		RDC$$$=*
16830		CMP 1308					;'BA`?
16840		BNE	RDC$BF
16850		LDA	CHRNUB					;'BA' HANDLING
16860		BEQ RD$SBF
16870		DEC	CHRNUB					;COUNTER DECREASE BY 1
16880		LDA	SCNPNT					;STORE SCREEN LINE POINTER
16890		STA	BANBAC					;TO BACK SPACE NUMBER ACCOUNTER
16900		JMP	RD$$BF
16910		RDC$BF=*
16920		NOP
16930		CMP	#$7F					;'DEL'?
 
 
 
 
 
16940		BNE RDCS$F 
16950		LDX CHRNUB 
16960		BEQ RD$SBF 
16970		DEC CHRNUB					;NUMBER ACCOUNTER AND BUFFER
16980		DEC CSBUFS					;OFFSET DECREASE BY 1 TO ELIMMINATE 
16990									;THE LAST WORD
17000		JMP RD$SB$
17010		RDCS$F=*
17020		CMP	#$05					;CONTROL-E?
17030		BNE RDCSB$
17040		JSR CRLFHD					;GIVING A 'CR','LF'COMMAND
17050		LDA	#$00					;SET SCREEN START POINTER TO ZERO
17060		STA SCNPTS 
17070		JMP RD$SBF					;GET NEXT CHARACTER 
17080		RDCSB$=*	
17090		CMP	#$10					;CONTROL-P?
17100		BNE	R$$SBF	
17110		LDA	#$B0					;REVERSE THE PRINTER FLAG
17120		FOR	PRTFLG	
17130		STA	PRTFLG	
17140		JMP	RD$SBF					;GET NEXT CHARACTER 
17150		R$$SBF-*	
17160		CMP	#$18					;'CONTROL-X '?
17170		BNE	R$C$BF
17180		RDCSB1=*
17190		LDA	SCMPTS					;KEEP BACKING SPACE UNTIL THE START 
17200									;POSITION OF CURRENT LINE ARRIVED
17210		CMP	SCNPNT
17220		BCS	RDCSBF
17230		DEC	SCNPNT
17240		JSR	BKSPAC
17250		JMP	RDCSB1
17260		R$C$BF=*
17270		CMP	#$15					;'CONTROL U'? 
17280		BNE	R$CS$F
17290		JSR	NWLNHD					;CREATE A NEW LINE
17300		JMP	RDCSBF
17310		R$CS$F=*
17320		CMP	#$12					;'CONTROL-R'?
17330		BNE	R$CSB$
17340		RD$$BF=*				
17350		JSR	NWLNHD					;NEW LINE HANDLING	
17360		LDY	#$01					;START TO WRITE A NEW LINE FROM THE	
17370									;FIRST CHARCACTER OF CURRENT LINE IN	
17380									;CONSOLE BUFFER
17390		STY	CSBUFS
17400		LDA	CHRNUB
17410		STA	TEMP
17420		RIICSB2=*
17430		BEQ	RD$S$F						
17440		INC	CSBUFS					;INCRE. OFFSET TO WRITE NEXT CHAR 
17450		LDY	CSBUFS
17460		LDA	(DEREG),Y					
17470		JSR	CSLOU$					;WRITE NEXT CHARACTER
17480		DEC TEMP
17490		JMP RDCSB2 
17500		RD$S$F=1
17510		LDA BANBAC			;IF AL CHAR HAVE RETYPED,CHECK FOR
17520		BNE RDCSBS			
17530		JMP RD$SBF			;IF BANBAC=0
17540		RDCSB5=*			
17550		SEC			
17560		SBC SCNPNT			;TO FIND THE DIFFERENCE NO. BETWEEN 
17570							;CURRENT ACCOUNTER AND PREVIOUS
17580							;ACCOUNTER
17590		STA BANBAC			
17600		RDCSB3=*			
17610		JSR BKSPAC			;BACK SPACE UNTIL CURRENT ACCOUNTER 
17620		DEC BANBAC			;MATCHING PREVIOUS ONE
17630		BNE RDCSB3 
17640		JMP RD$SBF 
17650		R$C3B$=*
17660		INC CSBUFS			;SET UFFSET TO CURRENT CHAR.
17670		LDY CSBUFS 
17680		STA (DEREG),Y		;STORE THE CHAR INTO CORRESPONDING 
17690							;LOCATIONN
17700		INC CHRNUB			;INCREASING CHR NUMBER 1
17710		RD$SB$=*
17720		PHA
17730		JSR CSLOU$			;TYPE IT
17740		PLA
17750		CMP	#$03			;CHECK FOR CONTROL-C
17760		BNE RDCSB4 
17770		LDA CHRNUB
17780		CMP	#$01 
17790		BNE RDCSB4 
17800		JMP $0000			;IF IS CTRL-C AND IN STARTING 
17810							;POSITION,GO TO WARM BOOT
17820		REICSB4=* 
17830		NOP
17840		NOP
17850		LDY	#$00			;TO COMPARE CHAR NO. WITH MAX NO.
17860		LDA	(DEREG),Y
17370		CMP	CHRNUB	
17880		BEQ	RDC$$F	
17890		JMP RD$SBF			;IF LESS THAN,GET NEXT CHAR.
17900		RDC$$F=*	
17910		LDY	#$01			;STORE CHR NO. TO CONSOLE BUFFER 
17920							;WHEN RETURN
17930		LDA CHRNUB	
17940		STA (DEREG),Y
17950		JMP	CRLFHD	
17960	;
17970	;
17980	;
17990	;
18000	;
18010	;
18020	;*******************************************************
18030	;*
18040	;*	FUNCTION 7 : GET INPUT/OUTPUT BYTE
18050	;*
18060	;*******************************************************
18070	;*
18030	;* ENTRY PARAMETERS :
18090	;* 		REGISTER X : $07
18100	;*
18110	;* 	RETURNED VALUE :
18120	;* 		REGISTER A : INPUT/OUTPUT BYTE VALUE
18130	;*
18140	;*******************************************************
18150	;
18160		GTIOBY=*
18170	;
18180		LDA IOBYTE
18190		JMP STRTFG
18200	;
18210	;*******************************************************
18220	;*
18230	;* 	FUNCTION 8 : SET INPUT/OUTPUT BYTE
18240	;*
18250	;******************************************************* *
18260	;*
18270	;* 	ENTRY PARAMETERS :
18280	;* 		REGISTER X : $08
18290	;* 		REGISTER A : INPUT/OUTPUT BYTE VALUE
18300	;*
18310	;*******************************************************
18320	;
18330		STIOBY=*
18340	;
18350		STA IOBYTE
18360		RTS
18370	;
18380	;******************************************************* *
18390	;*
18400	;* 	FUNCTION 9 : GET CONSOLE STATUS *
18410	;*
18420	;******************************************************* *
18430	;*
18440	;*	ENTRY PARAMETERS : 
18450	;*		REGISTER X : $09
18460	;*
18470	;*	RETURNED VALUE :
18480	;*		REGISTER A : CONSOLE STATUS
18490	;*
18500	;*******************************************************
18510	;
18520		GTCLST=*
18530	;
18540		JSR INTPHEI
18550		JNP STRTFG
	
18560		*=$DBCO 	
18570		START=$00 	
18580		CREG=$08 	
19590		DEREG=$09 	
18600		HLREG=$08 	
18610		HLREG1=$0D		
18620		FLAG=$0F						;BIT3:'1' FOR BUILD UP CHECK AREA 
18630										;BIT4:'1' FOR R/W SECTOR
18640										;BIT5:'1' FOR ADD MAP BIT 
18650										;BIT6:'1' FOR WRITE
18660										;BIT7:'1' FOR DIR ENTRY FINISH 
18670		DIRBFA=$12						;DIR BUFFER
18680		MAPBFA=$14						;MAP AREA
18690		CHKBFA=$16						;CHECK AREA
18700		RTNFLG=$18						;THREE RETURN FLAGS 
18710		DRERNB=$1C						;DIR ENTRY#
18720		DREROF=$1D						;DIR ENTRY OFFSET
18730		TEMP=$1F					
18740		BLKNUB=$21						;BLOCK NUMBER 
18750		TRKNUB=$22						;TRACK NUMBER
18760		TEMP1=$23		
18770		PRVDSK=$24						;PREVIOUS DISK#
18780		CRTDRN=$25						;RESERVED FOR DR OF FCB
18790		CMERCT=$27						;NUMBER OF MATCHING FCB WITH DIR 
18800		DERDSK=$29						;DESIRED DISK#
18810		RTNFG1=$2A						;AXULIRARY RETURN FLAG
18820		FLAG2=$2C		
18830		CRRCNB=$2D						;CR
18840		TLRCNB=$2E						;RC
18850		EXNTNB=S2F						;EX
18860		SECNUB=$30						;SECTOR# WITHIN A TRACK
18870		TEMP2=$37							
18880		BKRBLK=$31						;BACK BLOCK#
18890		ADVBLK=$33						;ADVANCED BLOCK#
18900		BKOSFG=$35						;BLOCK OFFSET FLAG
18910		BLKOFS=$36						;BLOCK OFFSET
18920		IOBFFG=$39						;'FLUSH' FLAG
18930		CRTDSK=$3A						;CURRENT DISK NO. 
18940		CBADRV=$55						;RESERVED FOR SERCH NEXT
18950		FLAG1=$58						
18960		SYMRST=$D9A6					;BDO1
18970		CSLIN=$D9C0			
18980		CSLOUT=$DA5C			
18990		LITOTT=$DA71			
19000		DRCSIO=$DA74			
19010		OUTBUF=$DA8B			
19020		RDCSBF=$DACD			
19030		GTIOBY=$D8B2			
19040		STIOBY=$D8B7			
19050		GTCLST=$DBBA			
19060		PAMTAB=$E41F					;BIOS
19070		LITOUT=$E5A9
19080		HOMEHD=$E5F5
19090		DKSEL1=$E643
19100		SETTR1=$E665
19110		SETSC1=$E668
19120		SETBL1=$E66B 
19130		STDMA1=$E66E 
19140		WRTIRK=$E822
14150		RWDBS1=$E887
19160		ERROR=$E928 
19170		SIOBDK=$E90A 
19180		DFBUFA=$E965 
19190		DIRBUF=$EB65 
19200		MAPAR0=$ED65
19210		MAPAR1=$EDA5
19220		CHKAR0=SEDE5 
19230		CHKAR1=$EDF3 
19240		FLCTBK=$EE01 
19250		IOBUF=$B000
19260		USERCD	.BYTE $01			;USER CODE
19270		WPTVCT	.BYTE $00			;R/O VECTOR
19280		LOGVTR	.BYTE $00			;LOGIN VECTOR
19290	;BRANCH TABLE
19300	BRHTAB	.WORD SYMRST,CSLIN,CSLOUT,LITOTT,DRCSIO
19310			.WORD OUTBUF,RDCSBF,GTIOBY,STIOBY,GTCLST 
19320			.WORD RSDKSM,GTLGVT,GTCRDK,GTMPLT,SETWPT 
19330			.WORD GTROVT,GTDKPA,SGTUCD,SETDMA,SELDSK 
19340			.WORD MAKFIL,DELFIL,OPNFIL,CLSFIL,RDRCSO 
19350			.WORD WTRCSO,RDRCRM,WIRCRM,SHFIST,SHNEXT 
19360			.WORD RENAME,CHATRB,CPFISZ,STRDRC,SIODSK
19370	;
19380	;*******************************************************
19390	;*
19400	;* FUNCTION 10 : RESET DISK SYSTEM
19410	;*
19420	;*******************************************************
19430	;*
19440	;*	ENTRY PARAMETERS : 
19450	;*		REGISTERX : $0A
19460	;*
19470	;*******************************************************
19480	;
19490		 RSDKSM=*
19500	;
19510		LDA	#$00			;INITIALIZE WRITING PROTECT VECTOR 
19520		STA LOGVTR			;& DISK LOG VECTOR
19530		STA WPTVCT			
19540		STA DERDSK			;SELECT DISK A 
19550		JSR S$LDSK			
19560		LDA #DFBUFA			;SELECT DEFAULT BUF FOR DMA
19570		LDX #DFBUFA/256	
19580		JMF STDMA1			
19590	;
19600	;
19610	;
19620	;*******************************************************
19630	;*
19640	;*	FUNCTION 11 : GET LOGIN VECTOR 
19650	;* 
19660	;*******************************************************
19670	;*
19680	;* 	ENTRY PARAMETERS :
19690	;* 		REGISTER X : $0B
19700	;*
19710	;* 	RETURNED VALUE :
19720	;* 		REGISTER A : LOGIN VECTOR
19730	;* 
19740	;******************************************************
19750	;
19760		GTLGVT=*
19770	;
19780		LDA LOGVTR
19790		JMP STRTFG
19800	;
19810	;*******************************************************
19820	;* 
19830	;* FUNCTION 12 : GET CURRENT DISK NUMBER *
19840	;* 
19850	;*******************************************************
19860	;*
19870	;*	ENTRY PARAMETERS : 
19830	;*		REGISTER X : $0C
19890	;*
19900	;*	RETURNED VALUE :
19910	;*		REGISTER A : CURRENT DISK NUMBER
19920	;*
19930	;*******************************************************
19940	;
19450		GTCRDK=*
19960		LDA CRTDSK
19970		JMP STRTFG
19980	;
19990	;********************************************************
20000	;*
20010	;* 	FUNCTION 13 : GET MAP ADDRESS OF CURRENT DISK *
20020	;* 
20030	;********************************************************
20040	;*
20050	;*	ENTRY PARAMETERS : 
20060	;*		REGISTER X : $0D
20070	;*
20080	;*	RETURNED VALUE :
20090	;*		REGISTER Y,A : MAP ADDRESS OF CURRENT DISK *
20100	;*
20110	;********************************************************
20120	;
20130		GTMPLT=*
20140	;
20150		LDA MAPBFA
20160		STA RTNFLG+1 
20170		LDA NAPBFA+1 
20180		STA RTNFLG+2
20190		RTS
20200	;
20210	;********************************************************
20220	;*
20230	;* 	FUNCTION 14 : SET WRITING PROTECT VECTOR
20240	;*
20250	;********************************************************
20260	;*
20270	;* 	ENTRY PARAMETERS :
20280	;*		REGISTER X : $0E
20290	;*
20300	;****************************************************
20310	;
20320		SETWPT=*
20330	;
20340		LDA	CRTDSK				;GET BIT PATTERN FOR CURRENT
20350		JSR	BNYBIT				;DISK
20360		ORA	WPTVCT
20370		STA	WPTVCT				;SET R/O FOR CURRENT DISK
20380		RTS
20390	;
20400	;******************************************************** 
20410	;*
20420	;* 	FUNCTION 15 : GET READ ONLY VECTOR
20430	;*
20440	;****************************************************** 
20450	;*
20460	;* 	ENTRY PARAMETERS :
20470	;* 		REGISTER X : $0F
20480	;*
20490	;* 	RETURNED VALUE :
20500	;* 		REGISTER A : READY ONLY VECTOR
20510	;*
20520	;********************************************************
20530	;
20540		GTROVT=*
20550	;
20560		LDA WPTVCT
20570		JMP STRTFG
20580	;
20590	;
20600	;
20610	;
20620	;
20630	;
20640	;
20650	;
20660	;
20670	;
20680	;
20690	;
20700	;*****************************************************
20710	;*
20720	;*	FUNCTION 1 6 : GET PARAMETER TABLE ADDRESS OF
20730	;* 					CURRENT DISK
20740	;*
20750	;*****************************************************
20760	;*
20770	;* 	ENTRY PARAMETERS :
20780	;*		REGISTER X : $10
20790	;*
20800	;* RETURNED VALUE :
20810	;*		REGISTER Y,A : PARAMETER TABLE ADDRESS
20820	;* 
20830	;********************************************************
20840	;
20850		GTDKPA=*
20860	;
20870		LDA	CRTOSK 
20880		LDX	#$03
20890		JSR	ASLDSR
20900		LDX	#PAMTAB							;GET CORRES. ADDR. 
20910		STX	HLREG
20920		LDX	#PAMTAB/256
20930		STX	HLREG+1 
20940		LDX	#$00
20950		STX	TEMP
20960		JSR	ADCOFS
20970		LOA	HLREG							;RETURN THE ADDR. 
20980		STA	RTNFLG+1
20990		LOA	HLREG+1
21000		STA	RTNFLG+2
21010		RTS
21020	;
21030	;*********************************************************
21040	;*
21050	;* 	FUNCTION 17 : SET/GET USERCODE
21060	;*
21070	;*********************************************************
21080	;*
21090	;*	ENTRY PARAMETERS :
21100	;*		REGISTER X : $11
21110	;*		REGISTER A : $FF (GET) OR USERCODE (SET)
21120	;*
21130	;*	RETURNED VALUE :
21140	;*		REGISTER A :CURRENT CODE OR (NO VALUE)
21150	;*
21160	;*********************************************************
21170	;
21180		SGTUCD=*
21190		CMP	#$FF					;CHECK WETHER SET OR GET
21200		ONE S$TUCD
21210		LDA USERCD					;GET IT
21220		JMP STRTFG
21230		S$TUCD=*
21240		AND	#$1F
21250		STA	USERCD						;GET IT 
21260		RTS
21270	;
21280	;*********************************************************
21290	;*
21300	;* FUNCTION 18 : SET DMA ADDRESS 
21310	;*
21320	;*****************************************************
21330	;*
21340	;* 	ENTRY PARAMETERS :
21350	;* 		REGISTER X : $12
21360	;* 		REGISTER Y,A : DMA ADDRESS
21370	;
21380	;*********************************************************
21390	;
21400		SETDMA=*
21410	;
21420		LDA DEREG
21439		LUX DEREG+1
21440		JMP STDMA1
21450	;
21460		ASLDSR=*					;VALUE*(2**(X))
21470	;								;WHERE VALUE IS IN A & TEMP
21480	;
21490		ASL	A
21500		ROL	TEMP
21510		DEX
21520		BNE	ASLDSR
21530		RTS
21540	;
21550		ADCOFS=*					;ADD OFFSET TO THE ADDR. 
21560	;
21570		CLC
21530		ADC HLREG
21590		STA HLREG
21600		LDA	TEMP	
21610		ADC	HLREG+1 
21620		STA	HLREG+1
21630		RTS
21640	;
21650		GETENT=*					;GET DESIRED DIR ENTRY ADDR. 
21660	;
21670		LDA DIRBFA
21680		STA HLREG
21690		LDA DIRBFA+1
21700		STA HLREG+1
21710		LDA DREROF+1
21720		STA TEMP
21730		LDA DREROF
21740		JMP ADCOFS
21750	;
21760		BNYBIT=*					;ENTRY:A BINARY
21770									;EXIT:A BIT PATTERN
21780	;
21790		TAX
21800		LDA	#$01
21810		B$YBIT=*
21820		DEX
21830		BMI BN$BIT
21840		ASL A
21850		JMP B$YBIT
21860		BN$BIT=*
21870		RTS
21880	;
21890		;FOR THE INPUT PHYSICAL BLOCK NO.IN A &TEMP
21900		;CACULATE THE CORRS. BYTE OFFSET FROM BIT MAP
21910		;AND STORE IT TO Y,THE BIT PATTERN WITHIN THE
21920		;BYTE ANDSTORE IT TO A
21930	;
21940		GTMAPB=*:
21950	;
21960		PHA								;LOW BYTE R-SHIFT 3 TIMES
21970		LSR	A
21980		LSR	A
21990		LSR	A
22000		LDX	#$05
22010		G$MAPB=*
22020		ASL	TEMP						;HIGH BYTE L-SHIFT 5 TIMES
22030		DEX	
22040		BNE	G$MAPB
22050		ORA	TEMP						;THE RESULT: PHY. BLOCK NO./8
22060		TAY
22070		PLA
22080		AND	#$07						;GET THE CORRES. BIT PATTERN 
22090		STA	TEMP+1
22100		LDA	#$07
22110		SEC
22120		SBC	TEMP+1 
22130		JMP	BNYBIT
22140	;
22150		GTBKNB=*						;GET PHYSICAL BLOCK NO. 
22160										;AND STORE IN A & TEMP
22170	;
22180		LDA	#$00
22190		STA TEMP  
22200		LDA (HLREG1),Y					;GET LOGICAL BLOCK NO.
22210		LDX	#$01						;AND *2
22220		JSR	ASLDSR
22230		TAX
22240		TYA
22250		LSR	A							;ODD OR EVEN? 
22260		BCS	G$BKNB						;ODD, -1 
22270		JSR	G$BKNB						;EVEN, -2
22280		G$BKNB=*
22290		CPX	#$00
22300		BNE GT$KNB
22310		DEC TEMP
22320		GT$KNB=* 
22330		DEX
22340		TXA
22350		RTS
22360	;
22370		MDFMPB=*						;BUILD OR MODIFY BIT MAP
22380	;
72390		JSR GTBKNB						;GET PHSICAL BLOCK NO.
22400		JSR GTMAPB
22410		PHA
22420		LDA	#$20						;ADD OR DELETE?
22430		BIT FLAG
22440		BEQ	M$FMPB
22450		PLA
22460		ORA (MAPBFA),Y					;SET CORRES. BIT
22470		STA (MAPBFA),Y
22480		RTS
22490		M$FMPB=*
22500		PLA
22510		EOR	#$FF
22520		AND (MAPBFA),Y					;RESET CORRES. BIT
22530		STA (MAPBFA),Y
22540		RTS
22550	;
22560		MDFMAP=*						;BUILD OR MODIFY BIT MAP FOR
22570										;WHOLE ENTRY'
22580	;
22590		LDA HLREG						;DIR ADDR. STORE TO HLREG1
22600		STA HLREG1
22610		LDA HLREG+1
22620		STA HLREG1+1
22630		LDY	#$0F
22640		MD$MAP=*
22650		INY
22660		CPY	#$20						;16 BYTES DONE?
22670		BNE M$FMAP						;NO, KEEP DOING
22680		RTS	
22690		M$FMAP=*	
22700		LDA (HLREG1),Y					;GET LOGICAL BLOCK NO.
22710		BEQ MD$MAP						;IF 0, SKIP IT
22720		STY TEMP1	
22730		JSR MDFMPB						;IF NO 0, MODIFY CORRE. BIT MAP
22740		LDY TEMP1	
22750		JMP MD$MAP	
22760	;	
22770		ADDDIR=*						;GET THE CHECKSUM OF THE DIR
22780										;BLOCK AND STORE IT TO X & TEMP
22790										;EXIT:X,TEMP SUM OF WHOLE DIR
22800	;
22810		LDX	#$02
22820		LDY	#$00
22830		LDA	#$00
22840		A$DDIR=*
22850		CLC								;ADD UP ALL BYTES IN THE BLOCK
	
22860		ADC (HLREG),Y 
22870		BCC AD$DIR
22880		INC TEMP 
22890		AD$DIR=*
22900		INY
22910		BNE A$DDIR
22920		INC HLREG+1
22930		DEX
22940		BNE	A$DDIR						;TWO PAGE DONE? 
22950		TAX
22960		RTS
22970	;
22980		DIRCHK=*						;BUILD OR CHECK CHECKSUM
22990	;
23000		LDA BLKNUB						;GET OFFSET FROM CHECKSUM AREA 
23010		LDX	#$01						;FOR DESIRED DIR BLOCK
23020		JSR ASLDSR
23030		PHA
23040		LDA	#$00						;SET DIR BUFFER ADDR. 
23050		STA TEMP
23060		LDA DIRBFA
23070		STA HLREG
23080		LDA DIRBFA+1
23090		STA HLREG+1
23100		JSR	ADDDIR						;GET CKECKSUM FOR THIS DIR BLOCK 
23110		PLA
23120		TAY
23130		TXA
23140		LDA	#$08
23150		BIT FLAG						;BUILD OR CHECK?
23160		BNE	D$RCHK
23170		TXA								;CHECKING CHECKSUM
23180		CMP (CHKBFA),Y
23190		BNE DI$CHK
23200		INY
23210		LDA	TEMP
23220		CMP	(CHKBFA),Y
23230		BNE	DI$CHK
23240		RTS
23250		DI$CHK=*
23260		JSR SETWPT						;IF NOT MATCH, SET CORRES. DISK
23270		LDA	#$06						;TO R/O AND DISPALY ERR
23280		JMP ERROR
23290		D$RCHK=*
23300		TXA								;BUILDING CHECKSUM 
23310		STA (CHKBFA),Y
23320		INY
23330		LDA TEMP
23340		STA (CHKBFA),Y
23350		RTS
23360		;
23370		DSKPRM=*						;GET CORRES. DISK PARAMS.
23380										;& STORE THEM TO DIRBFA,MAPBFA
23390										;AND CHKBFA
	
	
	
23400	;
23410		LDA CRTDSK
23420		JSR DKSELI 
23430		LDY	#$05 
23450		D$KPRM=*
23460		LDA (HLREG),Y  
23470		STA DIRBFAsY  
23480		DEY
23490		BPL D$KPRM
23500 ;	
23510		RWDRBK=*						;READ OR WRITE DIR BLOCK
23520 ;	
23530		JSR	R$DRBK						;SET DIR BUFFER FOR DMA 
23540		JSR	RWDBS1						;R/W A DIR BLOCK
23550		LDA	#DFBUFA						;RECOVE DMA TO DEFAULT BUFFER 
23560		LDX	#DFBUFA/256	
23570		JMP	STDMA1
23580		R$DRBK=*
23590		LDA	DIRBFA 
23600		LDX	DIRBFA+1 
23610		JMP	STDMA1
23620 ;
23630		RDDIRB=*						;READ DIR BLOCKS TO DIR BUFFER 
23640										;AND BUILD UP CHECKSUM
23650 ;	
23660		INC DRERNB						;SET CURRENT ENTRY NO, 
23670		LDA DRERNB 	
23680		CMP	#$70						;112 ENTRIES DONE?
23690		BCC R$DIRB 	
23700		LDA	#$80						;IF DONE, SET FLAG DONE
23710		ORA FLAG 	
23720		STA FLAG 	
23730		RTS	
23740		R$DIRB=*	
23750		AND	#$0F						;GET CORRES, ENTRY OFFSET 
23760		LDX	#$05						;AWAY FROM THE DIR BUFFER
23770		LDY	#$00	
23780		STY TEMP
23790		JSR ASLDSR 
23800		STA DREROF						;STORE IT 
23810		LDA TEMP
23820		STA DREROF+1 
23830		ORA DREROF						;FIRST ENTRY?
23840		BEQ BDD$RB 
23850		BIT FLAG1
23860		BMI BDD$RB 
23870		RTS								;IF NO, RETURN
23880		BDD$RB=*
23890		STA	FLAG1
23900		LDA	DRERNB
23910		AND	#$F0 
23920		LSR A
23930		LSR A
	
23940		LSR A
23950		LSR A
23960		STA BLKNUB						;SET BLOCK NO.
23970		JSR SETBL1
23980		LDA	#$03
23990		STA	TRKNUB						;SET DIR TRACK NO.
24000		JSR	SETTR1	
24010		JSR	RWDRBK						;READ THIS DIR BLOCK
24020		JMP	DIRCHK						;BUILD UP CHECKSUM
24030	;
24040		BUDMAP=*						;BUILD UP BIT MAP FOR
24050										;CURRENT DISK'
24060	;
24070		LDA	#$00						;INIT. BIT MAP TO 0
24080		LDY	#$3 F
24090		B$DMAP=*
24100		STA (MAPBFA),Y
24110		DEY
24120		BPL B$DMAP
24130		LDA	#$F F						;INIT. ENTRY COUNTER
24140		STA DRERNB
24150		LDA	#$2 8						;SET FLAG INDICATING READ BLOCK
24160		STA FLAG						;, BUILD BIT AMAP & CHECKSUM
24170		BUD$AP=*
24180		JSR RDDIRB						;READ A DIR BLOCK
24190		BIT FLAG						;112 ENTRIES DONE?
24200		BPL BUSMAP
24210		RTS								;YES, RETURN
24220		BU$MAP=*
24230		JSR GETENT						;GET CORRES. ENTRY ADDR. 	
24240		LDA $#E5
24250		LDY	#$00
24260		CMP	(HLREG),Y
24270		BEQ BUD$AP						;SKIP THE EMPTY ONE
24280		JSR MDFMAP						;BUILD UP THE BIT MAP FOR THE ENTRY
24290		JMP BUDSAP
24300	;
24310		LGNMAP=*						;LOG IN CURRENT DISK
24320	;
24330		JSR DSKPRM						;GET DISK PARA. FOR CURRENT DISK
24340		LDA CRTDSK
24350		JSR BNYBIT						;GET BIT PATTERN
24360		BIT LOGVTR
24370		BEQ L$GMAP
24380		RTS
24390		L$GMAP=*
24400		ORA LOGVTR
24410		STA LOGVTR						;LOG IN CURRENT DISK
24420		JMP BUDMAP						;BUILD UP BIT MAP & CHECKSUM
24430		RESV11*=*+3
24440	;
24450	;
24460	;
24470	;
24480	;
24490	;
24500	;********************************************************* 
24510	;*
24520	;*	FUNCTION 19 : SELECT DISK
24530	;*
24540	;**********************************************************
24550	;*
24560	;*	ENTRY PARAMETERS :
24570	;*		REGISTER X : $13
24580	;*		REGISTER A : SELECT DISK
24590	;*
24600	;**********************************************************
24610	;
24620		SELDSK=*
24630	;
24640		STA DERDSK						;CHECK LEGALITY
24650		CMP	#$02
24660		BCC SE$DSK
24670		LDA	#$02
24680		JMP ERROR
24690		SE$DSK=*
24700		CMP CRTDSK						;=CURRENT DISK?
24710		BNE S$LDSK						;IF NOT, SELECT IT AS CURRENT
24720		RTS
24730		S$LDSK=*
24740		JSR SIOBDK						;SEND LAST TRACK IN BUF TO DISK
24750		LDA DERDSK
24760		STA CRTDSK
24770		JMP LGNMAP						;BUILD UP BIT MAP & CHECKSUM FOR IT
24780	;
24790		MDFYS2=*						;SET FCB.S2 TO INDICATE FCB HAS BEEN
24800										;ACTIVED
24810	;
24820		LDY	#$0E
24830		LDA #380
24840		STA (DEREG),Y
24850		RTS
24860	;
24870		FCBINZ=*						;SELECT DISK ACCORDING TO FCB 
24880										;PUT USER'S CODE TO FCB. DR
24890	;		
24900		LDA	#$FF						;INIT. RETURN FLAG 
24910		STA	RTNFLG		
24920		LDY	#$00		
24930		LDA	(DEREG),Y					;CURRENT DISK IS DESIRED?
24940		AND	#$1F
24950		BEQ	F$BINZ
24960		STA	DERDSK						;IF NOT, STORE IT AS DESIRED 
24970		DEC	DERDSK 
24980		LDA	CRTDSK						;KEEP CURRENT DISK
25990		STA	PRVDSK 
25000		LDA	(DEREG),Y 
25010		STA	CRTDRN
25020		AND	#$E0
25030		STA (DEREG),Y
25040		LDA	DERDSK						;SELECT DESIRED DISK 
25050		JSR SELDSK
25060		F$BINZ=*
25070		LDA	USERCD						;STORE USERCODE TO FCB.DR 
25080		LDY	#$00
25090		ORA ( DEREG ),Y
25100		STA (DEREG),Y
25110		RTS
25120	;
25130		TETWPT=*					;TEST FOR DISK WRITING PROTECT
25140	;
25150		JSR T$TWPT 
25160		BNE TE$WPT 
25170		RTS
25130		TE$WPT=*
25190		LDA	#$04 
25200		JMP ERROR 
25210		T$TWPT=*
25220		LDA CRTDSK 
25230		JSR BNYBIT 
25240		BIT WPTVCT 
25250		RTS
25260	;
25270		FBDRMH=*						;MATCHING FCB WITH DIR 
25230	;
25290		LDA	#$FF						;INIT. ENTRY COUNTER
25300		STA RTNFG1					
25310		FBD$$$=*					
25320		STA DRERNB					
25330		STX CMERCT						;KEEP MATCH NUMBERS
25340		FBDR$$=*					
25350		LDA	#$00						;SET CHECKING,DIR NOT FINISH 
25360		STA FLAG						;AND READING BLOCK FLAG
25370		FB$RMH=*					
25380		JSR RDDIRB						;READA DIR BLOCK 
25390		BIT FLAG						;112 ENTRIES DONE?
25400		BMIFBD$$H					
25410		JSR GETENT						;IF NOT, GET DESIRED ENTRY ADDR. 
25420		LDX CMERCT					
25430		DEX								;TEST FOR MAKING FILE
25440		BEQ FED$MH					
25450		INX					
25460		LDY I$FF					
25470		F$DRMH=*					
25480		INY					
25490		DEX					
25500		BMIFBDR$H						;YES, FILE NAMEFOUND	
25510		CPY	#$0D	
25520		BEQ F$DRMH	
25530		LDA (DEREG),Y					;GET CURRENT CHAR AND MATCH IT 
25540		JMP F$$RMH
25550		FBD$MH=*
25560		LDA	#$E5						;IF MAKE FILE, MATCH $E5 
25570		LDY	#$00						;TO FIND AN EMPTY ENTRY
25580		FS$RMH=*				
25590		CMP	#$3F						;'?'?
25600		BEQ F$DRMH 
25610		SEC
25620		SBC (HLREG),Y
25630		AND	#$7F
25640		BEQ F$DRMH						;NEXT BYTE EXPECTED 
25650		BNE	FB$RMH						;NEXT ENTRY EXPECTED 
25660		FBDR$H=*		
25670		LDA DRERNB						;IF MATCH FOUND, SET MATCKED 
25680		STA RTNFLG+1					;ENTRYNO.
25690		STA RTNFG1 
25700		RTS
25710		FBD$$H=*
25720		LDA	#$F F						;IF NOT, SET $FF
25730		STA RTNFLG+1
25740		RTS
25750	;
25760		PTFBBK=*						;PUT FCB TO DISK
25770		JSR GETENT						;GET DESIRED ENTRY ADDR,.
25780		LDY	#$00 
25790		P$FBDK=*
25800		LDA (DEREG),Y					;COPY DESIRED CHARS. FROM FCB 
25810		STA (HLREG),Y					;TO DIR ENTRY
25820		INY
25830		DEX
25840		BNE P$FBDK 
25850		PT$BDK=*
25860		LDA	#$48 
25870		ORA FLAG						;SET WRITING BLOCK FLAG
25880		STA FLAG 
25890		JSR DIRCHK 
25900		LDA BLKNUB						;SET DIR BLOCK
25910		JSR SETBL1 
25920		LDA	#$03						;SET DIR TRACK NO.
25930		JSR SETTR1 
25940		JMP RWDRBK						;WRITE DIR BLOCK TO DISK
25950	;
25960		MKFILE=*
25970	;
25980		JSR TETWPT						;DISK WRITE PROTECTED 
25990		LDA #$10						;ORIGINAL MAKING?
26000		BIT FLAG2 
26010		BEQ M$FILE 
26020		LDX	#$0C 
26030		JSR FBDRMH						;YES, CHECK FOR DUPLICATION 
26040		BIT FLAG 
26050		BMI M$FILE 
26060		LDA	#$05						;IF DUPLICATED, ERR
26070		JMP ERROR 
26080		M$FILE=*
26090		LDX	#$01
26100		JSR FBDRMH						;GO TO FIND AN EMPTY DIR
26110		BIT FLAG						;MATCHED?
26120		BPL MK$ILE
26130		RTS
26140		MK$ILE=*
26150		LDY #$0D
26160		LDA	#$00
26170		MKF$LE=*
26180		STA	(DEREG),Y					;RESET REST BYTE IN FCB TO 0
26190		INY
26200		CPY$$20
26210		BNEMKF$LE
26220		LDX$$20
26230		JSR PTFBDK 						;WRITE IT BACK TO DIR TRACK 
26240		JMP	MDFYS2 						;SET BIT 7 OF S2 TO INDICATE ACTIVED
26250	;
26260	;******************************************************* *
26270	;*
26280	;*	 FUNCTION 20 : MAKE FILE *	
26290	;*	
26300	;******************************************************* *
26310	;*
26320	;* 	ENTRY PARAMETERS :	
26330	;* 		REGISTER X : $14	
26340	;* 		REGISTER Y,A : FCB ADDRESS	
26350	;*	
26360	;* 	RETURNED VALUE :	
26370	;* 		REGISTER A : $FF DIRECTORY SPACE OVERFLOW	
26380	;* 					DIRECTORY ENTRY NUMBER IF SUCCESS*	
26390	;*	
26400	;******************************************************* ;	
26410	;
26420		MAKFIL=*		
26430	;
26440		JSR FCBINZ			
26450		LDA	#$10							;SET BIT 4 OF FLAG2 TO INDICATE			
26460		STA FLAG2							;ORIGINAL MAKING		
26470		JMP	MKFILE		
26480	;
26490		SETRTN=* 
26500	;
26510		LDA RTNFG1
26520		JMP STRTFG 
26530	;
26540		TETFWT=*			 				;TEST FOR FILE WRITE PROTECT 
26550	;
26560		JSR GETENT							;GET DIR ENRTRY ADDR. 
26570		LDY	#$09							;GET DIR.T1 AND CHECK IT'S BIT 7
26580		LDA (HLREG),Y 
26590		TE$FWT=*
26600		ASL A
26610		BCS T$TFWT 
26620		RTS
26630		T$TEWT=*
26640		LDA	#$07
26650		JMP ERROR
26660	;
26670		DLFILE=*
26680	;
26690		JSR TETWPT						;DISK WRITE PROTECTED
26700		LDX	#$0C						;FIND DESIRED DIR ENTRY
26710		JSR FBDRMH
26720		DL$ILE=*
26730		BIT FLAG
26740		BPL D$FILE
26750		RTS
26760		D$FILE=*
26770		JSR TETFWT						;FILE WRITE PROTECTED
26780		JSR GETENT						;GET DESIRED ENTRY ADDR. 
26790		LDY	#$00						;SET $E5 TO INDICATE DELETED
26800		LDA	#$E 5
26810		STA (HLRE6),Y
26820		JSR MDFMAP						;MODIFY MAP
26830		JSR PT$BDK						;PUT DIR TO DISK
26840		JSR FBDR$$
26850		JMP DL$ILE						;KEEP DOING, TILL ALL DONE
26860		RESV12*=*+3
26870	;
26380	;******************************************************* 
26690	;*
26900	;*	FUNCTION 2 1 : DELETE FILE 
26910	;*
26920	;******************************************************* 
26930	;*
26940	;* 	ENTRY PARAMETERS :
26950	;* 		REGISTER X : $15
26960	;* 		REGISTER Y,A: FCB ADDRESS
26970	;*
26980	;* RETURNED VALUE :
26990	;* 		REGISTER A : $FF FILE NOT FOUND
27000	;*					DIRECTORY ENTRY NUMBER IF SUCCESS *
27010	;*
27020	;*******************************************************
27030	;
27040		DELFIL=*
27050	;
27060		JSR	FCBINZ 
27070		JSR DLFILE 
27080		JMP SETRTN
27090	;
27100		CPDRFB=* 							;COPY DIR ENTRY TO FCB
27110	;
27120		JSR	GETENT 
27130		LDY	#$00
27140		C$DRFB=*
27150		LDA	(HLREG),Y
27160		STA (DEREG),Y
27170		INY
27180		CPY	#$20 
27190		BNE C$DRFB 
27200		RTS
27210	;
27220		OPFILE=*
27230	;
27240		LDX	#$0D							;FIND DESIRED DIR ENTRY
27250		JSR FBDRMH 
27260		BIT FLAG 
27270		BPL O$FILE 
27280		RTS
27290		O$FILE=*
27300		JSR CPDRFB							;COPY DIR ENTRY TO FCB
27310		JMP MDFYS2
27320	;
27330	;*******************************************************
27340	;*
27350	;* 	FUNCTION 22 : OPEN FILE
27360	;*
27370	;*******************************************************
27380	;*
27390	;* 	ENTRY PARAMETERS : 
27400	;* 		REGISTER X : $16 
27410	;* 		REGISTER Y,A : FCB ADDRESS 
27420	;* 
27430	;* 	RETURNED VALUE : 
27440	;* 		REGISTER A : $FF FILE NOT FOUND 
27450	;*					DIRECTORY ENTRY NUMBER IF SUCCESS * 
27460	;*
27470	;******************************************************* 
27480	;
27490		OPNFIL=*
27500	;
27510		JSR FCBINZ 
27520		JMP OPFILE
27530	;
27540		CLFILE=*
27550	;
27560		LDA	#$00
27570		STA	RTNFLG+1
27580		JSR	TETWPT							;DISK WRITE PROTECTED
27590		LDY	#$0E
27600		LDA	(DEREG),Y
27610		ASL	A
27620		ASL	A
27630		BCS	C$FILE
27640		RTS
27650		C$FILE=4
27660		LDX	#$0D							;FIND A MATCHED ENTRY 
27670		JSR FBDRMH
27680		BIT FLAG 
27690		BPL CL$ILE 
27700		RTS
27710		CL$ILE=*
27720		JSR GETENT				;GET THE ADDR. 
27730		LDY	#$10
27740		CLFI$$=*
27750	;COPY FILE LOCATION AREA IN FCB TO THE DIR ENTRY'
27760	;NOTE : IF (CORRS. BYTES NOT MATCH) AND (NONE OF '
27770	;THEM ARE 0 , THEN ERR. OTHERWISE, COPY NONE 0 BYTE'
27780	;TO 0 BYTE IF ONE OF THEM IS 0; OR LEAVE MATCHED'
27790	;PAIR ALONE'
27800		LDA (DEREG),Y			;COPY FILE LOCATION AREA IN FCB
27810		BNE CLF$LE
27820		LDA (HLREG),Y
27830		STA (DEREG),Y
27840		CLF$LE=*
27850		LDA (HLREG),Y
27860		BNE CLFI$E
27870		LDA (DEREG),Y
27880		STA (HLREG),Y
27890		CLFI$E=*
27900		LDA (DEREG),Y
27910		CMP (HLREG),Y
27920		BNE	CLFIL$
27930		INY
27940		CPY	#$20 
27950		BNE	CLF#$$
27960		LDY	#$0F				;COPY 'RC' FROM FCB TO DIR ENTRY 
27970		LDA	(DEREG),Y
27980		STA	(HLREG),Y
27990		JMP	PT$BDK				;PUT DIR BLOCK TO DISK
28000		CLFIL$=*
28010		DEC RTNFLG+1			;IF ERR, SET $FF TO INDICATE NOT SUECC.
28020		RTS
28030	;
28040	;********************************************************* 
28050	;*
28060	;* 	FUNCTION 23 : CLOSE FILE 
28070	;*
28080	;*********************************************************
28090	;*
28100	;*	ENTRY PARAMETERS :
28110	;* 		REGISTER X : $17
28120	;* 		REGISTER Y,A: FCB ADDRESSS;
28130	;*
28140	;* 	RETURNED VALUE :;
28150	;* 		REGISTER A : $FF FILE NOT FOUND;
28160	;* 		DIRECTORY ENTRY NUMBER IF SUCCESS 
28170	;* 
28180	;*********************************************************
28190	;
28200		CLSFIL=*
28210	;
28220		JSR FCBINZ
28230		JMP CLFILE
28240	;
28250		STRTFG=*				;SET RETURN FLAG
28260	;
28270		STA RTNFLG+1 
28280		RTS
28290	;
28300		FLEDRT=*						;FILE END RETURN
28310	;
23320		LDA	#$01 
28330		JMP STRTFG
23340	;
28350		GETREC=*						;GET RC,EX,CR AND STORE THEM
28360	;
28370		LDY	#$0C
28380		LDA (DEREG),Y 
28390		STA EXNTNB 
28400		LDY	#$0F
28410		LDA (DEREG),Y 
28420		STA TLRCNB 
28430		LDY	#$20
28440		LDA (DEREG),Y 
28450		STA CRRCNB 
28460		RTS
28470	;
28480		TETOPN=*						;;TEST FOR FCB OPENING
28490	;
28500		LDY	#$0E
28510		LDA (DEREG),Y 
28520		ASL A
28530		RCS T$TOPN 
28540		LDA	#$08
28550		JMP ERROR 
28560		T$TOPN=*
28570		RTS
28580	;	
28590		GTBKOF=*						;KNOWING FCB.RC TO GET CURRENT 
28600										;POSITION IN FCB FILE LOCATION AREA' 
28610										;TO Y AND SECTOR# WITHIN THIS BLOCK 
28620										;TO TEMP2
28630	;	
28640		LDA	#$03	
28650		AND	CRRCNB	
28660		STA TEMP2	
28670		LDA	CRRCNB	
28680		LSR A	
28690		LSR A	
28700		CLC	
28710		ADC	#$10 	
28720		TAY	
28730		RTS	
28740		;	
28750		GTRLBS=*						;GET PHYSICAL BLOCK NO. AND 
28760										;SECTOR NO. WITHIN THE BLOCK
28770	;
28780		JSR GTBKOF						;GET CURRENT POSITION AND 
28790										;SECTOR NO. WITIHIN THE BLOCK	
		
		
28800		LDA	(DEREG),Y				;GET LOGICAL BLOCK NO. 
28810		BEQ	G$RLBS					;SKIP 0
28820		LDX	DEREG
28830		SIX	HLREG					;CACULATE PHYSICAL BLOCK NO.1
28340		LDX	DEREG+1
28850		STX	HLREGI+1
28360		JSR	GTBKNB
28870		LDX	#$01
28380		GSRLBS=*
28890		RTS
28900	;
28910		GTTKSC=*					;GET TRACK# AND PHYSICAL SECTOR
28920									;WITHIN THIS TRACK
28930									;ENTRY PHYSICAL BLOCK# IN A,TEMP
28940									;EXIT X TRACK#,A PHYSICAL SECTOR
28950	;
28960		LDX	#$FF
28970		G$TKSC=*
28980		SEC
28990		INX							;BLOCK#  DIV 7 TO GET TRACK NO.
29000		SBC	#$07
29010		BCS GSTKSC
29020		DEC TEMP
29030		BPL G$TKSC
29040		ADC	#$07					;BLOCK# MOD 7
29050		ASL	A			
29060		ASL	A						;(BLOCK# MOD 7)*4
29070		CLC			
29080		ADC	TEMP2					;ADDING THE SECTOR NO. WITHIN 
29090									;THE BLOCK TO GET SECTOR NO. '
29100									;WITHIN THE TRACK
29110		PHA			
29120		TXA			
29130		SED			
29140		ADC	#$04 ;						
29150		CLD			
29160		TAX							;PUT TRACKNO.TO X 
29170		PLA							;PUT SECTOR NO. TO A
29180		RTS			
29190	;			
29200		RWSCDF=*					;READ A SECTOR INTO DEFAULT BUFFER
29210	;		
29220		STX TRKNUB
29230		JSR SETSC1
29240		TXA
29250		JSR SETTR1					;SET TRACK NO.
29260		JMP RWDBS1
29270	;
29280		MDFFCB=*					;MODIFY FCB TO FIT NEXT OPERATION
29290	;
29300		BIT FLAG2					;RAN. OR SEQ. MODE?
29310		BPL M$FFCB
29320		INC CRRCNB
29330		M$FFCB=*
29340		LDA	CRRCNB
29350		LDY	#$20
29360		STA	(DEREG),Y				;STORE TO FCB.CR 
29370		LDA TLRCNB
29380		LDY	#$0F
29390		STA	(DEREG),Y				;STORE TO FCB.RC
29400		RTS
29410	;
29420		HDNTEN=*					;DEAL WITH NEXT EXTENT ENTRY
29430	;
29440		JSR	CLFILE					;CLOSE THE CURRENT EXTENT
29450		LDX	RTNFLG+1				;$FF MEANS NOT SUCCES.
29460		INX
29470		ONE	H$NTEN					;SUCCES! CONTINUE.
29480		RTS
29490		H$NTEN=*
29500		LDY	#$0C
29510		LDA	#$01
29520		CLC
29530		ADC	(DEREG),Y				;INCREAMENT 'EX' BY 1
29540		STA	(DEREG),Y
29550		LDX	#$0D					;FIND A CORRES. 'EX' IN DIR
29560		JSR	FBDRMH
29570		BIT	FLAG					;FOUND?
29580		BPL	H$$TEN
29590		BIT	FLAG2					;IF NOT, CHHECK R OR W?
29600		BVC	HDN$EN
29610		JMP	FLEDRT					;IF R, ERR
29620		HDN$EN=*
29630		JSR	MKFILE					;IF W, CREATE A NEW 'EX'
29640		BIT	FLAG
29650		BPL	HDNT$N
29660		LDA	#$03
29670		JMP	STRTFG
29680		H$$TEN=*
29690		JSR	O$FILE					;COPY CORRES. BYTES IN DIR TO FCB
29700		HEINT$N=4
29710		JSR	GETREC					;GET 'EX','RC','CR' AND STORE THEM 
29720		LDA	#$00
29730		JMP	STRTFG					;SET SUCCES.FLAG
29740	;
29750		RDRCS1=*
29760	;
29770		JSR	TETOPN					;FILE OPENED?
29780		LDA	#$E0					;SET FLAG2 TO INDICATE SEQ. R
29790		STA	FLAG2
29800		RDRCS$=*
29810		JSR	GETREC
29820		LDA	CRRCNB					;'CR'<'RC'?
29830		CMP	TLRCNB
29840		BCC	R$RCSQ					;YES, GO AHEAD TO READ
29850		CMP	#$40					;NO, CHECK 'CR'=$40?
29860		BEQ	RD$CSQ
29870		JMP	FLEDRT					;IF NOT,ERR
29880		RD$CS0=*
29890		JSR HDNTEN					;CLOSE CURRENT 'EX', OPEN NEXT
29900		LDA	#$00					;RESET CRRCNB
29910		STA CRRCNB
29920		LDA	RTNFLG+1				;SUCCES.
29930		BEQ R3RCSO
29940		JMP STRTFG
29950		R$RCSQ=* 
29960		JSR	GTRLBS					;GET PHY. BLOCK NO.
29970		BNE RDRC$Q 
29980		LDA	#$02					;IF CORRES. LOG. BLO. NO.=0, ERR
29990		JMP STRTFG 
30000		RDRC$Q=*
30010		JSR GTTKSC					;GET TRACK NO. & SECTOR NO.
30020		LDY	#$10 
30030		STY	FLAG 
30040		JSR RWSCDF					;READ A SECTOR 
30050		JMP MDFFCB					;MODIFY BIT MAP
30060	;
30070	;*******************************************************
30080	;*
30090	;* 	FUNCTION 24 : READ SEQUENTIALLY
30100	;*
30110	;*******************************************************
30120	;
30130	;*	ENTRY PARAMETERS
30140	;*		REGISTER X : $18
30150	;*		REGISTER Y , A : FCB ADDRESS
30160	;*
30170	;*				RETURNED VALUE 
30180	;*				REGISTER A:$00 SUCCESS
30190 	;*							$01 FILE END
30200 	;*							$02 RECORD NOT IN DISK
30210 	;*
30220 	;*******************************************************
30230	;
30240		RDRCSQ=1
30250 	;
30260		JSR FCBINZ 
30270		JMP RDRCS1
30280 ;
30290		FNDEPT=*					;FIND EMPTY BLOCK,ENTRY A,TEMP 
30300									;PHY. BLOCK OF THE ONE BEFORE IT
30310									;EXIT A,TEMP EMPTY PHY. BLOCK# 
30320
30330		STA BKRBLK					;SET BK. & AD. COUNTER 
30340		STA ADVBLK 
30350		LDA TEMP
30360		STA BKRBLK+1 
30370		STA ADVBLK+1 
30380		LDA	#$01					;SET CURRENT POINTER ODD OR EVEN FLAG
30390		AND BLKOFS
30400		STA BKOSFG 
30410		F$$EPT=*
	
30420		LDA BKRBLK						;BK. SEARCK REACH BOTTOM? 
30430		ORA BKRBLK+1	
30440		BEQ F$DEPT						;YES:GO TO AD. SEARCH
30450		FNS$PT=*  	
30460		LDA BKRBLK 	
30470		BNE FN$EPT						;BK. SEARCH
30480		DEC BKRBLK+1	
30490		FN$EPT=*
30500		DEC BKRBLK
30510		LDA BKRBLK					;BK. COUNTER MATCH THE E/O FLAG SET BEF?
30520		AND	#$01
30530		CMP	BKOSFG 
30540		BNE	F$$EPT 
30550		LDA	BKRBLK						;NO, SKIP IT
30560		LDX	BKRBLK+1					;YES, GET CORRES. BYTE & BIT PATTERN 
30570		STX	TEMP						;IN BIT MAP AREA
30580		JSR	GTMAPB
30590		TAX
30600		AND	(MAPBFA),Y 
30610		BNE	F$DEPT						;OCCUPIED?
30620		TXA								:YES: TO AD. SEARCH 
30630		ORA	(MAPBFA),Y					;NO,SET BIT MAP
30640		STA	(MAPBFA),Y 
30650		LDA	BKRBLK+1 
30660		STA	TEMP						;BK. COUNTER AS FOUND PHY. BLOCK 
30670		LDA	BKRBLK						;NO. THEN RETURN
30680		RTS
30690		F$DEPT=*
30700		LDA	ADVBLK 
30710		CMP	#$FF						;AD. SEARCH TOP REACHED?
30720		BNE	FNDSPT 
30730		LDA	ADVBLK+1 
30740		CMP	#$01 
30750		BEQ	FNDE$T						;YES: TO CHECK IF BA. BOTTOM REACHED? 
30760		FNDSPT=*				
30770		INC	ADVBLK						;INCREMENT AD. COUNTER BY 1 
30780		BNE	FNDE$$				
30790		INC	ADVBLK+1
30800		FNDE$$=*
30810		LDA	ADVBLK						;THE SAME PROCESS AS IN BA. SEARCH 
30820		AND	#$01				
30830		CMP	BKOSFG 
30840		BNE	F$DEPT 
30850		LDA	ADVBLK 
30860		LDX	ADVELK+1 
30870		STX	TEMP 
30880		JSR	GTMAPB
30890		TAX
30900		AND	(MAPBFA),Y 
30910		BNE	F$$EPT
30920		TXA
30930		ORA	(MAPBFA),Y 
30940		STA	(MAPBFA),Y
30950		LDA	ADVBLK+1
30960		STA TEMP
30970		LDA ADVBLK
30980		RTS
30990		FNDE$T=*
31000		LDX	BKRBLK+1					;BA. BOTTOM ALSO REACHED?
31010		INX	
31020		BNE	FN$$PT						;NO, TO BA. SEARCH 
31030		LDA	#$A8						;REPORT MAP OVERFLOW
31040		STA FLAG2	
31050		RTS	
31060	;	
31070		RELFOM=*						;PHY. BLOCK# TO LOGICAL ONE 
31080										;EXIT X LOGICAL BLOCK#
31090	;
31100		LDX TEMP
31110		STX TEMPI
31120		PHA
31130		INC BLKOFS						;GET CURRENT POSITION IN
31140		LDA BLKOFS						;FCB FILE LOCATION AREA
31150		LSR A							;EVEN OR ODD?
31160		PLA
31170		ADC	#$01						;EVEN/ADD 1;ODD,ADD 2
31180		BCC R$LFOM						;TO PHY. BLOCK#
31190		INC TEMP1
31200		R$LFOM=*
31210		LSR A							;DIVIDED BY 2
31220		LSR TEMPI
31230		BCC RE$FOM
31240		ORA	#$80
31250		RE$F0M=*
31260		TAX
31270		DEC BLKOFS
31280		RTS
31290	;
31300		WTRCS1=*
31310	;
31320		JSR TETOPN						;OPENED?
31330		LDA	#$A0						;SET FALG2 TO INDICATE SEQ. W
31340		STA FLAG2
31350		WTRCS$=*
31360		JSR	TETWPT						;DISK W PROTECTED? 
31370		LDY	#$09
31380		LDA	(DEREG),Y
31390		JSR	TE$FWT						;FILE W PROTECTED? 
31400		JSR	GETREC
31410		LDA	CRRCNB						;'CR'<$40
31420		CMP	#$40 
31430		BCC	W$RCSO 
31440		JMP	FLEDRT
31450		W$RCSQ=*
31460		JSR GTBKOF						;GET CUR. RECORD POST. IN
31470										;FILE LOCATION AREA'
31480		STY BLKOFS	
31490		LDA (DEREG),Y					;GET LOG. BLOCK NO.
31500		BEQ	WTR$$3						;IF 0,GO TO FIND EMPTY BLOCK 
31510		JSR GTRLBS						;NO,GET CORRES. PHY. BLOCK NO.
31520		WTRC$$=*	
31530		JSR GTTKSC						;GET TRACK# & SECTOR#
31540		LDY	#$50	
31550		STY FLAG						;SET 'WRITE' TO FLAG 
31560		JSR RWSCDF						;WRITE A RECORD
31570		LDY	#$0E	
31580		LDA	#$C0	
31590		STA (DEREG),Y					;SET 'WRITTEN' FLAG IN FCB.S2 
31600		LDA CRRCNB						;'CR'<'RC'
31610		CMP TLRCNB	
31620		BCC WTR$$Q						;GO AHEAD WITH NO INCRESE 'RC' 
31630		STA TLRCNB						;STORE 'CR' TO 'RC'
31640		INC TLRCNB						;INCRESE 'RC' BY 1
31650		WTR$$G=*	
31660		CMP	#$3P						;'CR'=$3F?
31670		BNE	WT$$SG						;NO,MODIFY FCB & RETURN 
31680		BIT	FLAG2						;OTHERWISE, CHECK RANDOM
31690		BPL	WT$$S0 
31700		JSR	MDFFCB						;IF SEG. CLOSE THIS EXTENT & 
31710		JSR	HDNTEN						;OPEN NEXT
31720		LDA	RTNFLG+1
31730		BNE	W$$CSQ						;IF UNSUCC., LEAVE 'CR'=$3F ALONE 
31740		LDA	#$FF						;IF SUCC., SET 'CR'=$FF
31750		STA CRRCNB 
31760		W$$CS0=*
31770		LDA	#$00
31780		STA RTNFLG+1 
31790		WT$$SQ=*
31800		JMP MDFFCB 
31810		WTR$$$=*						;MODIFY FCB, 'CR' WILL BE $40 OR $00 
31820		STA TEMP						;FIND AN EMPTY BLOCK
31830		LDA	#$01
31840		CPY	#$10
31850		BEQ WT$CDSO						;FIRST POINTER?
31860		BEY								;YES, SET BASS PHY. BLOCK# TO $01
31870		LDA (DEREG),Y 
31880		BEQ WT$CSO						;NO, GET PHY. BLOCK# BEFORE IT 
31890		LDA DEREG						;0?
31900		STA HLREG1						;NO, CONVERT IT TO BASS BLOCK#
31910		LDA DEREG+1 
31920		STA HLREG1+1 
31930		JSR GTBKNB 
31940		WT$CSQ=*
31950		JSR FNDEPT						;TO FIND AN EMPTY BLOCK 
31960		TAX
31970		LDA	#$08						;MAP OVERFLOW?
31980		BIT FLAG2 
31990		BEQ WIR$S0 
32000		LDA	#$02 
32010		JMP STRTFG 
32020		WTR$S0=*
32030		TXA
	
32040		PHA
32050		JSR	RELFOM							;NO,CHANGE FOUND# TO CORRES, LOGICAL#
32060		LDY	BLKOFS			
32070		NOP			
32080		NOP			
32090		NOP			
32100		TXA			
32110		STA	(DEREG),Y						;STORE TO COORES POINTER 
32120		PLA									;WRITE THE RECORD TO FIRST
32130		JMP	WTRC$$							;SECTOR OF FOUND BLOCK
32140	;
32150	;
32160	;
32170	;********************************************************
32180	;*
32190	;* 	FUNCTION 2 5 : WRITE SEQUENTIALLY
32200	;*
32210	;************************************************
32220	;*
32230	;*	ENTRY PARAMETERS
32240	;*		REGISTER X : $19
32250	;*		REGISTER Y,A : FCB ADDRESS
32260	;*
32270	;*		RETURNED VALUE:
32280	;*		REGISTER A :	#$00 SUCCESS
32290	;*						$01 CAN'T CLOSE OR OPEN NEXT 
32300	;*						EXTENT
32310	;*						$02 MAP OVERFLOW
32320	;*
32330	;*******************************************************
32340	;	 
32350		WTRCSQ=*
32360	;	
32370		JSR FCBINZ 
32380		JMP WTRCS1
32390	;
32400	;
32410		FNDCRN=*							;FIND CURRENT LOGIC RECORD#
32420										;AND EXTENT
32430	;							
32440		LDY	#$21							;GET R0				
32450		LDA	(DEREG),Y							
32460		AND	I9;3F							;CACULATE DESIRED RECORD#		
32470		LDY	#$20							
32480		STA	(DEREG),Y						;STORE TO FCB.CR				
32490		INY							
32500		LDA	(DEREG),Y						;GET R0 AGAIN			
32510		STA	TEMP1							
32520		INY							
32530		LDA	(DEREG),Y						;GET R1			
32540		STA	EXNTNB							;CACULATE THE 'EX' DESIRED
32550		ROL	TEMP1		
32560		ROL	EXNTNB		
32570		ROL	TEMPI		
32580		ROL	EXNTNB		
32590		LDA	EXNTNB							;DESIRED 'EX'=CURRENT 'EX'?
32600		LDY	#$0C		
32610		CMP	(DEREG),Y		
32620		BE0	FNSCRN		
32630		JSR	CLFILE							;IN NOT, CLOSE CURRENT EXTENT 
32640		LDX	RTNFLG+1						;SUCCESS?	
32650		LDA	#$03		
32660		INX		
32670		BEQ	FNDCR$		
32680		LDA	EXNTNB							;YES,STORE DESIRED TO FCB.CR
32690		LDY	#$0C		
32700		STA	(DEREG),Y		
32710		JSR	OPFILE							;OPEN THIS EXTENT 
32720		LDX	RTNFLG+1						;SUCCESS?	
32730		INX			
32740		BNE	FN$CRN		
32750		LDA	#$04							;IF NOT, CHECK R OR W
32760		BIT	FLAG2 
32770		BVS	FNDCR$
32780		JSR	MKFILE							;IF W, CREATE A NEW NEXT 
32790		LDA	#$05 
32800		LDX	RTNFLG+1						;SUCCESS?
32810		INX
32820		BEQ FNDCR$							;IF NOT REPORT ERR
32830		FN$CRN=*
32840		LDA	#$00
32850		FNDCRS=*
32860		JMP STRTFG
32870	;
32880		RDRCR1=*
32890	;
32900		JSR TETOPN 
32910		LDA #$60							;SET FLAG TO INDICATE RANDOM R
32920		STA FLAG2
32930		JSR FNDCRN					;FOND 'EX' & 'CR' DESIRED
32940		BNE R$RCRM
32950		JMP RDRCS$					;IF SUCCESS, READ THE RECORD
32960		R$RCRM=*
32970		RTS
32980	;
32990	;*******************************************************
33000	;*
33010	;*	FUNCTION 26 :READ RANDOM
33020	;*
33030	;*******************************************************
33040	;*
33050	;*	ENTRY PARAMETERS :
33060	;*		REGISTER X	#$1A
33070	;*		REGISTER Y,A: FCB ADDRESS
33080	;*
33090	;*	RETURNED VALUE :
33100	;*		REGISTER A : $00 SUCCESS
33110	;*					$01	READ UNWRITTEN DATA 
33120	;*					$03	CAN'T CLOSE CURRENT EXTENT 
33130	;*					$04	SEEK TO UNWRITTEN EXTENT
33140	;*
33150	;*******************************************************
33160	;
33170		RDRCRM=*
33180	;
33190		JSR FCBINZ
33200		JMP RDRCR1
33210	;
33220		WIRCR1=4
33230	;
33240		JSR TETOPN					;DISK W PROTECTED?
33250		LDA	#$20					;SET FLAG TO INDICATE RANDOM W
33260		STA FLAG2					
33270		JSR FNDCRN					;FIND 'EX' & 'CR' DESIRED
33280		BNE W$RCRM					
33290		JMP WTRCS$					;IF SUCCESS, WRITE THIS RECORD
33300		W$RCRM=*
33310		RTS
33320	;
33330	;
33340	;
33350	;
33360	;
33370	;
33380	;
33390	;
33400	;
33410	;
33420	;
33430	;
33440	;
33450	;
33460	;*************************************************** 
33470	;*
33480	;* FUNCTION 27 : WRITE RANDOM
33490	;*
33500	;**************************************************  
33510	;*;
33520	;* 	ENTRY PARAMETERS :;
33530	;* 		REGISTER X : $1B
33540	;*		REGISTER Y,A: FCB ADDRESS 
33550	;*
33560	;*	RETURNED VALUE
33570	;*		REGISTER A : $00SUCCESS
33580	;*					$02	MAP OVERFLOW
33590	;*					$03	CAN'T CLOSE CURRENT EXTENT 
33600	;*					$05	DIRECTORY OVERFLOW
33610	;*
33620	;*******************************************************
33630	;
33640		WIRCRM=*
33650	;
33660		JSR FCBINZ
33670		JMP WTRCRI
33680	;
33690	;****************************************************** 
33700	;*
33710	;* FUNCTION 28 : SEARCH FOR FIRST
33720	;*
33730	;***************************************************
33740	;*
33750	;* 	ENTRY PARAMETERS : *
33760	;*		REGISTER X : $1C
33770	;*		REGISTER Y,A:FCB ADDRESS
33780	;*	
33790	;*	RETURNED VALUE :
33800	;*		REGISTER A : $FF FILE NOT FOUND
33810	;*				 NUMBER OF DESIRED ENTRY WHITHIN 
33820	;*				 DIRECTORY BLOCK
33830	;*
33840	;*******************************************************
33850	;
33860		SHFIST=*
33870		JSR FCBINZ						;INITIALIZE FCB
33880		LDA DEREG						;RESERV FCB ADR FOR
33890										;SERCH NEXT
33900		STA	CBADRV
33910		LDA	DEREG+1
33920		STA	CBADRV+1
33930		LDX	#$0D						;FIND DESIRED DIR
33940		JSR	FBDRMH
33950		BIT FLAG						;IF NOT FOUND,RETURN WITH A=FF
33960		BPL S$FIST
33970		RTS
33980		S$FIST=*
33990		LDA DRERNB
34000		STA CBADRV+2
34010		LDA *DFBUFA						;IF FOUND,COPY DIRBUFFER TO
34020										;DEFAULT BUFFER
34030		STA HLREG1
34040		LDA IDFBUFA/256
34050		STA HLREG1+1
34060		LDA DIRBFA
34070		STA HLREG
34080		LDA DIRBFA+1
34090		STA HLREG+1
34100		LDA	#$00
34110		STA TEMP
34120		LDA RTNFLG+1
34130		AND	#$0C
34140		LDX	#$05
34150		JSR ASLDSR
34160		JSR ADCOFS						;GET THE ADDR. OF MATCHE DRECORD
34170		LDY	#$00
34180		SH$IST=*
34190		LDA	(HLREG),Y					;COPY MATCHED DIR TO DEFAULT BUFFER 
34200		STA	(HLREG1),Y
34210		INY
34220		CPY	#$80
34230		BNE	SH$1ST
34240		LDA RTNFLG+1					;GET THE OFFSET AWAY FROM THE START
34250		AND	#$03	
34260		STA RTNFLG+1
34270		RTS
34280	;
34290	;**********************************************************
34300	;*
34310	;* FUNCTION 2 9 SEARCH FOR NEXT
34320	;*
34330	;**********************************************************
34340	;*
34350	;* 	ENTRY PARAMETERS : 
34360	;*		REGISTER X : $10
34370	;*
34380	;*	RETURNED VALUE :*
34390	;*		REGISTER A : $FF FILE NOT FOUND
34400	;*			NUMBER OF DESIRED ENTRY WITHIN 
34410	;*			DIRECTORY BLOCK
34420	;*
34430	;**********************************************************
34440	;
34450		SHNEXT=*
34460	;
34470		LDA	CBADRV						;GET RESERVED ADR
34480		STA	DEREG
34490		LDA	CBADRV+1
34500		STA	DEREG+1
34510		JSR	FCBINZ
34520		LDA	#$FF
34530		STA	FLAG1
34540		STA RTNFG1
34550		LDX	#$0D
34560		LDA CBADRV+2
34570		JSR FBO$$$						;GO AHEAD TO FIND NEXT USING
34580										;PREVIOUS FCB AND THE PREVIOUS FOUND 
34590										;ENTRY
34600		BIT FLAG	
34610		BPL S$FIST						;IF FOUND, GO TO COPY THEM
34620		RTS
34630	;
34640		TETOUP=*
34650	;
34660		CLC
34670		LDA DEREG						;CHANGE ADDR. TO FCB LOCATION AREA
34630		ADC	#$10
34690		STA DEREG
34700		BCC T$TOUP
34710		INC DEREG+1
34720		T$TOUP=*
34730		LDX	#$0C	
34740		JSR	FBDRMH							;TRY TO FIND DUPLICATE
34750		BIT	FLAG	
34760		BMI	TE$DUP	
34770		PLA									;IF FOUND,REPORT ERR
34780		PLA	
34790		LOA	#$80	
34800		JMP STRTFG	
34810		TESOLIP=*	
34820		CLC	
34830		LDA DEREG							;NO, RECOVE THE FCB ADDR. 
34840		ADC	#$F0	
34850		STA	DEREG	
34860		LDA	DEREG+1	
34870		ADC	#$FF 	
34880		STA	DEREG+1	
34890		RTS	
34900	;	
34910		RENAMM=*	
34920	;	
34930		JSR TETWPT							;DISK W PROTECTED?
34940		LDX I$0C	
34950		JSR FBDRMH							;TRY TO FIND THE OLD FILE
34960		RE$AMM=*	
34970		BIT FLAG							;FOUND?
34980		BPL R$NAMM	
34990		RTS	
35000		R$NAMM=*	
35010		JSR TETFWT							;FILE W PROTECTED 
35020		JSR GETENT							;GET DIR ENTRY
35030		LDA	#$F F	
35040		STA TEMP	
35050		LOA	#$F0	
35060		JSR ADCOFS							;SUBTRACT FROM $10 
35070		LDX	#$0C
35080		LDY	#$10
35090		JSR P$FBLIK						;MODIFY DIR DR-T3 ACCORDING TO FCB 
35100										;DO-D1 AND WRITE IT BACK TO DISK DIR.
35110		JSR FBDR$$						;FIND NEXT EXTENT AND DEAL WITH IT
35120										;UNTIL ALL FILES ARE DEALT.
35130		JMP RE$AMM
35140	;
35150	;****************************************************
35160	;*
35170	;*	FUNCTION 30 : RENAME FILE;
35180	;*
35190	;*********************************************************
35200	;*
35210	;*	ENTRY PARAMETERS :
35220	;*		REGISTER X	: $1E
35230	;*		REGISTER Y,A: FCB ADDRESS
35240	;*
35250	;*	RETURNED VALUE :
35260	;*		REGISTER A : #$FF FILE NOT FOUND
35270	;*					$80 THE NEW NAME IS ALREADY IN DIR.
35280	;*					DIR CODE FROM $00-$6F IF SUCCESS	;
35290	;*
35300	;**********************************************************
35310	;
35320		RENAME=*
35330	;
35340		JSR FCBINZ
35350		LDY	#$00				;COPY 'DR' IN OLD FILE TO 'DR' IN
35360		LDA (DEREG),Y			;NEW FILE
35370		LDY I $10
35380		STA (DEREG),Y
35390		JSR TETDUP				;TEST DUPLICATE
35400		JSR RENAMM				;RENAME!
35410		JMP SETRTN
35420	;
35430		CHATRT=*
35440	;
35450		JSR TETWPT
35460		LDX	#$0C				;TRY TO FIND A ENTRY IN DIR
35470		JSR FBDRMH
35480		CHSTRT=*
35490		BIT FLAG
35500		BPL C$ATRT
35510		RTS
35520		C$ATRT=*
35530		LDX	#$0C				;COPY FCB TO DIR TO CHANGE THE
35540		JSR PTFBDK 				;ATTR.
35550		JSR FBDR$$				;KEEP FINDING
35560		JMP CHSTRT
35570	;
35580	;
35590	;
35600	;
35610	;
	
	
	
	
35620	;******************************************************
35630	;*
35640	;* 	FUNCTION 31 : CHANGE ATTRIBUTES
35650	;*
35660	;*******************************************************
35670	;*
35680	;* 	ENTRY PARAMETERS
35690	;* 		REGISTER X : $1F
35700	;* 		REGISTER Y,A : FCB ADDR. 
35710	;*
35720	;* 	RETURNED VALUE : $FF FILE NOT FOUND
35730	;*					 DIR NO. IF SUCCESS
35740	;*
35750	;****************************************************
35760	;
35770		CHATRB=*
35780	;
35790		JSR FCBINZ
35800		JSR CHATRT
35810		JMP SETRTN
35820	;
35830	;*******************************************************
35840	;*
35850	;*	FUNCTION 32 : COMPUTE FILE SIZE
35860	;*
35870	;*******************************************************
35880	;*
35890	;*	ENTRY PARAMETERS
35900	;*		REGISTER X : $20
35910	;*		REGISTER Y,A : FCB ADDRESS
35920	;*
35930	;*	RETURNED VALUE :
35940	;*		REGISTER A : $FF FILE NOT FOUND
35950	;*				OTHERWISE R0,R1 CONTAIN FILE SIZE 
35960	;*
35970	;*******************************************************
35980	;
35990		CPFISZ=*
36000	;
36010		JSR FCBINZ
36020		LDA	$00							;INIT. R0 &R1
36030		LDY	$#21
36040		STA	(DEREG),Y
36050		INY
36060		STA	(DEREG),Y
36070		LDX	$#0C						;GO AHEAD TO FIND THE FILE
36080		JSR	FBDRMH
36090		CPF$SZ=*
36100		BIT FLAG						;FOUND?
36110		BPL C$FISZ
36120		RTS
36130		C$FISZ=*
36140		JSR GETENT							;YES,SET HLREG ADDRESS OF THIS ENTRY
36150		LDY	#$0F	
				
	
	
	
	
	
	
36160		LDA (HLREG),Y						;GET THE NUMBER OF TOTAL RECORDS 
36170		CLC	
36180		LDY	#$2 1							;BE ADDED TO SUN STORED IN R0,R1
36190		ADC (DEREG),Y 	
36200		STA (DEREG),Y	
36210		BCC CP$ISZ
36220		INY
36230		LDA
36240		ADC (DEREG),Y
36250		STA (DEREG),Y
36260		CP$ISZ=*
36270		JSR FBDR$$							;KEPT FINDING UNTIL WHOLE DIRECTORY IS
36280											;SEARCHED
36290		JMP CPF$SZ
36300	;
36310	;*********************************************************
36320	;*
36330	;*	FUNCTION 33 : SET RANDOM RECORD 
36340	;*
36350	;********************************************************* *
36360	;*	ENTRY PARAMETERS :
36370	;*		REGISTER X : $21
36380	;*		REGISTER Y,A: FCB ADDRESS 
36390	;*
36400	;*	RETURNED VALUE :
36410	;*		REGISTER A :$FF FILE NOT FOUND
36420	;*					OTHERWISE R0,R1 CONTAIN NUMBER OF 
36430	;*					DESIRED RECORD WITH R0 BEING THE 
36440	;*					LEAST SIGNIFICANT BYTE
36450	;*
36460	;*********************************************************
36470	;
36480	;
36490		STRDRC=*
36500	;
36510		LDY	#$0C						;GET 'EX'
36520		LDA (DEREG),Y
36530		STA TEMPI
36540		LDY	#$20						;GET CR
36550		LDA (DEREG),Y
36560		LSR TEMPI						;RIGHT SHIFT 'EX' ONCE
36570		BCC S$RDRC
36580		NOP								;THAT MEANS NUMBER
36590										;OF RECORDS SOULD BE ADDED BY $40
36600		ADC	#$3F
36610		S$RDRC=*
36620		LSR TEMPI						;RIGHT SHIFT 'EX' AGAIN
36630		BCC ST$DRC
36640		NOP								;NUMBER OF RECORDS
36650										;SHOULD BE ADDED BY $80
36660		ADC	#$7F
36670		ST$DRC=*
36680		LDY	#$2 1						;NOW PUT THE LOWER BYTE OF TOTAL NUMBER
36690		STA (DEREG),Y					;TO THE R0
36700		INY
36710		LDA TEMP1							;THE HIGHER BYTE TO R1
36720		STA (DEREG),Y
36730		RTS 
36740	;
36750	;
36760	;
36770	;
36780	;
36740	;
36300	;
36810	;
36820	;
36830	;******************************************************* 
36840	;*
36850	;*	FUNCTION 34 : SENT I/O BUFFER BACK TO DISK
36860	;*  
36870	;*******************************************************
36880	;*
36890	;* 	ENTRY PARAMETERS : 
36900	;* 		REGISTER X : $22 
36410	;*
36920	;******************************************************
36930	;
36940		SIODSK=*
36950	;
36960		JMP SIOBDK
36970	;
36980		RETURN=*
36990	;
37000		LDA RTNFLG					;DISK NEEDS TO CHANGE BACK?
37010		BEQ R$TURN 
37020		LDA	#$00 
37030		TAY
37040		STA (DEREG),Y 
37050		LDA CRTDRN					;STORE BACK THE 'DR'
37060		BEQ R$TURN
37070		STA (DEREG),Y
37080		LDA PRVDSK					;GET RESERVED DISK NO.
37090		STA DERDSK 
37100		JSR SELDSK					;CHANGE BACK TO CURRENT DISK 
37110		R$TURN.*
37120		LDY RTNFLG+2				;RETURN THE FLAG OR ADDR. NEEDED
37130		LDA RTNFLG+1 
37140		RTS
37150		.END