ulx3s_zx_spectrum

Verilog ZX Spectrum 48k core for the Ulx3s ECP5 board.

Supports HDMI output and VGA output using a Digilent VGA Pmod.

Uses a PS/2 keyboard.

Games can be loaded in .z80 format from the ESP32.

Does not support models other than the Spectrum 16k and 48k.

The open source ZX Spectrum Basic opense.rom is used. The original ZX Spectrum 48k rom (48.rom) also works and can be downloaded from here.

To build and upload the bit file, do:

cd ulx3s
make prog

The default build is for the 85f. For other models, use the DEVICE parameter to the make file, e.g. make DEVICE=12k.

To set up the ESP32 follow the instructions at https://github.com/emard/esp32ecp5.

Upload the esp32/spiram.py and roms/opense.rom files to the ESP32.

You can then upload a game from an SD card via the ESP32 by:

import spiram, os
from machine import SDCard
os.mount(SDCard(slot=3),"/sd")
spiram.loadz80("/sd/mygame.z80") 

The game should then start immediately.