c64-zig

Commodore 64 definitions and bindings in Zig.

A Zig translation of the C64 headers from llvm-mos-sdk (c64.h, _vic2.h, _sid.h, _6526.h, cbm.h, charset.h).

Requirements

Add the dependency:

zig fetch --save git+https://github.com/SimoneFelici/c64-zig

Import it in build.zig:

const c64_dep = b.dependency("c64_zig", .{});
exe.root_module.addImport("c64", c64_dep.module("c64"));

Then use it:

const c64 = @import("c64");

const c64 = @import("c64");

const VIC = c64.vic;

export fn main() void {
    VIC.bgcolor[0] = .black;
    VIC.bordercolor = .blue;
}

Or use this repo as a baseline for the project

Name	Type	Address	Description
`vic`	`*volatile Vic2`	`$D000`	VIC-II video chip
`sid`	`*volatile Sid`	`$D400`	SID sound chip
`cia1`	`*volatile Cia`	`$DC00`	CIA 1: keyboard, joysticks, IRQ
`cia2`	`*volatile Cia`	`$DD00`	CIA 2: serial bus, VIC-II bank, NMI
`color_ram`	`[*]volatile u8`	`$D800`	Color RAM
`Color`	`enum(u8)`		The 16 C64 colors
`ch_f1` … `ch_f8`	`u8`		PETSCII codes of the function keys
`joy_*_mask`	`u8`		Joystick bit masks

The register layouts are translated from llvm-mos-sdk