HBC-56: 65C02 + TMS9918A on a backplane

It's alive! Had to recreate the classic Amiga Boing Ball demo on my PICO-56.

The PICO-56 is my HBC-56 (65C02/TMS9918A/AY-3-8910) homebrew computer emulated on a single $4 Raspberry Pi PIco.

Created a new repo for the PICO-56 project: https://github.com/visrealm/pico-56

The complete HBC-56 (65C02/TMS9918A/AY-3-8910) homebrew CPU now emulated on a $4 Raspberry Pi Pico. Project details coming soon: https://github.com/visrealm/pico-56 Here's a sneak peek at the new PCBs

https://github.com/visrealm/hbc-56

This release includes all build targets and is the first produced using GitHub CI:

• Windows
• Linux-Ubuntu (clang)
• Linux-Ubuntu (gcc)
• WebAssembly

Windows/Linux

Run the emulator Hbc56Emu(.exe)

A number of ROMs are included with each build. When you run the emulator without command-line arguments, you will be prompted for a ROM image (.o file). Matching debugging (.o.lmap and .o.rpt) files will be loaded automatically.

WebAssembly

The WebAssembly build must be served by a http server. file:// protocol isn't supported. An easy way to do this is using python's http.server:

> python -m http.server
Serving HTTP on :: port 8000 (http://[::]:8000/) ...

Full Changelog: v1.0...v1.1

Started working on a Q*bert clone for my 6502 / TMS9918 build with PCM audio samples on my AY-3-8910s. Here's some footage from my emulator:

visrealm/hbc-56: Homebrew 6502 on a backplane computer (github.com)

Wrote four different output modes for Matt Heffernan's 8-bit (mandelbrot) Battle Royale. Making use of the TMS9918A's Graphics I, Graphics II and Multicolor modes. All tests are run on my 65C02 @ 3.6864MHz. I think the seldom-used Multicolor mode at 64x48 looks alright for this.

A brief montage of mostly unreleased footage covering the first 12 months of my HBC-56. From breadboards to custom protoboards to today. 

Have now added part 2 of this. Implementing the RAM/ROM paging in the emulator and writing some test code to test on the emulator and the real deal.

The latest card is complete. It's a 96KB RAM/ROM card with runtime-configurable banks/pages. This video covers the design, operation, construction and testing of the new card, including PLD development. 

New video covering the design, assembly and testing of my new TMS9918A card just landed.

Thanks to @PCBWay Official 

My new 65C02 CPU card. Thanks to  @PCBWay Official who has provided me with a handful of custom PCBs to replace my old hand-wired cards.

I have captured the trials and tribulations of converting the old hand-wired card to a custom PCB in the following video: 

As always, schematics and code are in my GitHub repository.