erfan-khadem / rpi8080

An rp2040 based intel 8080 emulator with debugger, physical & virtual IN/OUT port and interrupt.

rpi8080

An rp2040 based intel 8080 emulator with debugger, physical & virtual IN/OUT port and interrupt.

Note: The project code is fairly complete and usable, but the documentation is not ready yet.

In this project, 8080's emulation core is based on superzazu 8080's work.

In order to use the project, first build it using pico-sdk and cmake and flash it onto your favorite rp2040 development board. You might want to disable the default input/output pins or change their configuration.

Next, write your code in asm80. After reset SP will be at 0xFFF0 and PC starts at 0x0100 so adjust your ORG accordingly. After verifying your assembly program, use "Download BIN" option and save the binary. After this run python3 programmer.py [rp2040 serial port] output.bin to program your virtual 8080. You have the full 64kB of 8080's address space to your code as R/W memory. Note that your binary will always be saved in rpi's SRAM, so you have to re-program every time you reset your board. By default, the CPU will run at 1us per T-state but you can make this slower.

After this, open a serial monitor (like screen or putty) and write anything to start the CPU. If you write help it will show the supported debug commands.

Pictures

rpi8080's Issues

[RFC]: merge flags of state registrar

It seems there is no need to declare flags as bit fields.
Just use an unit8 and preprocessor macros
and logical operations.