diff --git a/src/arduino_io.inl b/src/arduino_io.inl
index aabcdac..61a62bb 100644
--- a/src/arduino_io.inl
+++ b/src/arduino_io.inl
@@ -155,7 +155,7 @@ void bbepWriteCmd(BBEPDISP *pBBEP, uint8_t cmd)
         pBBEP->is_awake = 1;
     }
     digitalWrite(pBBEP->iDCPin, LOW);
-    delay(1);
+    delayMicroseconds(1);
     digitalWrite(pBBEP->iCSPin, LOW);
     if (pBBEP->iSpeed == 0) { // bit bang
         SPI_Write(pBBEP, &cmd, 1);
diff --git a/src/bb_ep.inl b/src/bb_ep.inl
index d6fcdde..94a5b7c 100644
--- a/src/bb_ep.inl
+++ b/src/bb_ep.inl
@@ -3725,6 +3725,46 @@ const uint8_t epd81c_init_full[] PROGMEM = {
     0x00
 };
 
+const uint8_t epd133_spectra_init[] PROGMEM = {
+    BUSY_WAIT,
+    10, 0x74, 0xc0, 0x1c, 0x1c, 0xcc, 0xcc, 0xcc, 0x15, 0x15, 0x55, // AN_TM (master only)
+    7, 0xf0, 0x49, 0x55, 0x13, 0x5d, 0x05, 0x10, // CMD66
+    3, UC8151_PSR, 0xdf, 0x6b, // panel setting
+    2, UC8151_PLL, 0x08, // PLL
+    2, UC8151_CDI, 0xf7, // VCOM and data interval
+    3, UC8151_TCON, 0x03, 0x03, // TCON
+    2, 0x86, 0x10, // AGID
+    2, UC8151_PWS, 0x22, // PWS
+    2, 0xe0, 0x01, // CCSET
+    5, UC8151_TRES, 0x04, 0xb0, 0x03, 0x20, // resolution
+    7, UC8151_PWR, 0x0f, 0x00, 0x28, 0x2c, 0x28, 0x38, // power (master only)
+    2, 0xb6, 0x07, // EN_BUF (master only)
+    3, UC8151_BTST, 0xd8, 0x18, // BTST_P (master only)
+    2, 0xb7, 0x01, // BOOST_VDDP_EN (master only)
+    3, 0x05, 0xd8, 0x18, // BTST_N (master only)
+    2, 0xb0, 0x01, // BUCK_BOOST_VDDN (master only)
+    2, 0xb1, 0x02, // TFT_VCOM_POWER (master only)
+    1, UC8151_PON, // power on
+    BUSY_WAIT,
+    0x00
+};
+// Slave (CS2) init: only the registers both controllers need; no power-stage regs.
+const uint8_t epd133_spectra_init_slave[] PROGMEM = {
+    BUSY_WAIT,
+    7, 0xf0, 0x49, 0x55, 0x13, 0x5d, 0x05, 0x10, // CMD66
+    3, UC8151_PSR, 0xdf, 0x6b,
+    2, UC8151_PLL, 0x08,
+    2, UC8151_CDI, 0xf7,
+    3, UC8151_TCON, 0x03, 0x03,
+    2, 0x86, 0x10, // AGID
+    2, UC8151_PWS, 0x22,
+    2, 0xe0, 0x01, // CCSET
+    5, UC8151_TRES, 0x04, 0xb0, 0x03, 0x20,
+    1, UC8151_PON,
+    BUSY_WAIT,
+    0x00
+};
+
 #ifdef NO_RAM
 uint8_t u8Cache[128]; // buffer a single line of up to 1024 pixels
 #else // we need a larger cache for 4-bit panels
@@ -3820,6 +3860,7 @@ const EPD_PANEL panelDefs[] PROGMEM = {
     {400, 600, 0, epd40_spectra_init, NULL, NULL, BBEP_7COLOR, BBEP_CHIP_UC81xx, u8Colors_spectra}, // EP40_SPECTRA_400x600 GDEP040E01 Spectra 6 4" 400x600
     {176, 264, 0, badger2350_init_full, badger2350_init_fast, badger2350_init_part, BBEP_NEEDS_EXTRA_INIT, BBEP_CHIP_SSD16xx, u8Colors_2clr}, // EP27_176x264
     {176, 264, 0, badger2350g_init_full, badger2350g_init_fast, NULL, BBEP_NEEDS_EXTRA_INIT | BBEP_4GRAY, BBEP_CHIP_SSD16xx, u8Colors_4gray},// EP27_176x264_4GRAY
+    {1200, 1600, 0, epd133_spectra_init, NULL, epd133_spectra_init_slave, BBEP_NEEDS_EXTRA_INIT | BBEP_SPLIT_BUFFER | BBEP_7COLOR, BBEP_CHIP_UC81xx, u8Colors_spectra}, // EP133_SPECTRA_1200x1600 EL133UF1 (Soldered Inkplate 13 SPECTRA)
 };
 //
 // Set the e-paper panel type
diff --git a/src/bb_epaper.cpp b/src/bb_epaper.cpp
index acb2292..9ae5f48 100644
--- a/src/bb_epaper.cpp
+++ b/src/bb_epaper.cpp
@@ -240,6 +240,34 @@ int rc = BBEP_ERROR_BAD_PARAMETER;
                 return BBEP_SUCCESS;
             }
             break;
+        case EPD_INKPLATE13SPECTRA: // DC:14 RST:4 BUSY:7 CS_M:42 CS_S:39 MOSI:40 SCK:38
+            if (setPanelType(EP133_SPECTRA_1200x1600) == BBEP_SUCCESS) {
+                // Drain the panel's capacitors by holding all of its pins low,
+                // otherwise it sometimes refuses to refresh
+                {
+                    const uint8_t u8Pins[8] = {14, 42, 39, 4, 7, 21, 6, 5};
+                    for (int i = 0; i < 8; i++) {
+                        pinMode(u8Pins[i], OUTPUT);
+                        digitalWrite(u8Pins[i], LOW);
+                    }
+                }
+                delay(50);
+                digitalWrite(6, HIGH);  // BS0 high
+                digitalWrite(14, HIGH); // D/C starts high; library will toggle it per command
+                digitalWrite(21, HIGH); // EPD power enable
+                delay(100); // give the panel power time to stabilize
+                // Both CS pins must be set before initIO() because it sends the init
+                // sequence to both controllers of this dual-controller panel
+                _bbep.iCS1Pin = 42;
+                _bbep.iCS2Pin = 39;
+                digitalWrite(39, HIGH); // de-select the second controller
+                initIO(14, 4, 7, 42, 40, 38, 10000000);
+                pinMode(7, INPUT_PULLUP); // BUSYN was driven low during the drain step
+                setRotation(270);
+                return BBEP_SUCCESS;
+            }
+            break;
+
         case EPD_TRMNL_OG: // DC:5 CS:6 RST:10 BUSY:4 MOSI:8 SCK:7
             if (setPanelType(EP75_800x480) == BBEP_SUCCESS) {
                 initIO(5, 10, 4, 6, 8, 7, 10000000);
diff --git a/src/bb_epaper.h b/src/bb_epaper.h
index 9821d5e..73ff816 100644
--- a/src/bb_epaper.h
+++ b/src/bb_epaper.h
@@ -187,6 +187,7 @@ enum {
     EPD_M5_PAPER_COLOR, // 4" 600x400 Spectra6
     EPD_SEEED_STICKY, // 3.97" 800x480 B/W
     EPD_SEEED_STICKY_4GRAY,
+    EPD_INKPLATE13SPECTRA,
     EPD_PRODUCT_COUNT
 };
 
@@ -268,6 +269,7 @@ enum {
     EP40_SPECTRA_400x600, // GDEP040E01 Spectra 6 4" 400x600
     EP27_176x264, // Badger2350
     EP27_176x264_4GRAY, // Badger2350
+    EP133_SPECTRA_1200x1600, // EL133UF1 (Soldered Inkplate 13 SPECTRA) Spectra 6, dual controller
     EP_PANEL_COUNT
 };
 #ifdef FUTURE