This is a scratchpad repository containing my Z80 sandbox.
The most interesting for other people is most probably an assembler written in Python.
The assembler is more-than-two-pass assembler to make code more readable than optimized.
I've also written a 2-pass Z80 assember in C which is much faster. Check it out here.
For now the other part of the project consists of:
- a main board with 10 MHz Zilog Z80 CPU and some LEDs,
- a RAM board with two 62256 SRAM chips, 32 kiB of memory each and 7-segment displays showing data and address bus state,
- a CLKMOD board acting as a clock and interrupt controller.
Implying the following specs:
- Up to 1 MHZ Z80 CPU (because of bottleneck that is CLKMOD which will
be replaced with a crystal oscillator)
- 64 kiB SRAM
- No external non-volatile memory
- No IO at the moment
At the moment I'm developing the new IO Controller and IO device modules:
- 128x160 TFT display module,
- PS/2 keyboard input module.
In the legacy/ directory there are some IO controller files which I used
for communicating with the CPU via serial port and low-resolution VGA output.
-
z80asm– Python dual-syntax (i8080, Z80) assembler/disassembler module -
busctl/– Bus controller (and RAM Uploader) -
clkmod/– Clock emulator -
fontmaker/– Little HTML/JS utility for creating fonts -
legacy/– Old unused controllers -
lib/– ASM libraries -
schematics/– KiCAD schematics -
static/andtemplates/– Flask assets -
tft– TFT Display Controller -
ctl.py– Flask GUI for the clock emulator -
prog.py– Bus controller RAM programming interface -
serialprompt.py– Utility for fast testing of serial communication