My HBC-56, a 65C02/TMS9918A homebrew computer on a backplane, fully emulated on a Raspberry Pi Pico.

Emulating the following HBC-56 hardware

• 65C02 CPU
• 65C22 VIA
• TMS9918A VDP
• Dual AY-3-8910 PSGs
• Dual NES controller inputs
• PS/2 keyboard input
• 96KB Banked RAM/ROM

Making use of my various emulation libraries (and more):

• vrEmu6502 - 6502/65C02 CPU emulation library (C99)
• vrEmu6522 - 6522/65C22 VIA emulation library (C99)
• vrEmuTms9918 - TMS9918A/TMS9929A VDP emulation library (C99)

Full source code and a bunch of tutorials (episodes) now available on GitHub: visrealm/pico-56

Flexible!

The hardware can be used for any Raspberry Pi Pico project with:

• 12-bit (4096 color) VGA output
• PS/2 keyboard (read and write)
• Dual NES controllers
• Stereo audio output
• MicroSD card support
• External power and reset

Complete kits

Complete PICO-56 kits are now available on Tindie: tindie.com/products/visrealm/pico-56-kit

The following video details the building and configuring of a PICO-56 kit:

Resources

Pi Pico binary also available in the GitHub repo releases.

Follow along on YouTube here: youtube.com/@TroySchrapel

Many ROMs including source code available in the HBC-56 GitHub repository including:

• BASIC
• Breakout clone
• Invaders clone (WIP)
• Q*Bert (WIP)
• Music and graphics demos
• Programming tutorials for the various hardware devices

The HBC-56 project comes complete with development environment, including a Desktop emulator for ultra-fast development cycles. Just drop the binaries on an SDCard and plug-in to the PICO-56.