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Vic-20 emulation on a Raspberry Pi Pico

License: MIT License

C 99.83% CMake 0.17%

basic commodore emulator rp2040 rp2040-zero vga vic20

picovic's Introduction

PICOVIC

This is a Commodore Vic-20 emulator for the Raspberry Pi Pico

Most of the 6502 emulation code is from fake6502.

A PS/2 keyboard can be plugged in to the pico according to the schematic and is used as an input device.

VGA output is based on the scanvideo code from pico-extra

The emulation is extremely basic and for example the VIAs are only emulated so that the cursor works in BASIC. The VIC chip only has the most simple functionality, in the interest of speed and laziness. However since for the time being the emulated speed is higher than the original VIC-20, more functionality will be added in the future.

Running BASIC video

Hardware

I designed a PCB to go with it. You can check out the hardware folder to get the source, or download the schematic and gerber files.

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picovic's Issues

PS/2 Keyboard not working

The keyboard LED flashed once when the power is supplied to the PICO but nothing happened any key pressed/released.

The VGA output is working and cursor was flashing.

Cursor does not work

Need to implement VIA timers / IRQs at least roughly to get the cursor to blink when in basic.

Add PS/2 or USB keyboard support

Confused

I can build it, but it does not do anything on the pico demo VGA board I have:

https://shop.pimoroni.com/products/pimoroni-pico-vga-demo-base?variant=32369520672851

A little help with in the readme on how to configure it would be nice, I assume the VGA pins need assigning or the video mode selecting, i've no idea how.

Thanks.

Add load / save from SD card

Program code mismatched with the circuit diagram

There are a few issues found:

PICO_SCANVIDEO_COLOR_PIN_BASE is set to 2 but the circuit diagram is 0.
In the circuit diagram, bits in a video byte is R3 G3 B2. But some of the program code is R3 G2 B3 (rgb[0] to rgb[8]) or B3 G2 R3 (rgb[9]-rgb[15].

Add sound output support

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