BASIC for my 6502

A project log for HBC-56: 65C02 + TMS9918A on a backplane

HBC-56 A homebrew 8-bit computer with a backplane. Initially with a 65C02 CPU card, a TMS9918A VDP and dual AY-3-8910 audio.

Troy SchrapelTroy Schrapel 12/12/2021 at 00:240 Comments

So, now I have a keyboard, I decided to do something to make use of it. BASIC seems appropriate, so I "ported" EhBASIC to my system, including TMS9918, character LCD and 128x64 graphics LCD drivers.

In doing so, I discovered a bug in my emulator. The BIT opcode in the 6502 library I was using didn't set the processor flags correctly. So, I tracked that down and fixed it.

All the code is available and you can follow along using my HBC-56 emulator (also in the GitHub repo).

If you've been thinking about BASIC for your 6502 build, it's not too hard to do.