hbc-56 VS f1microcomputer

I use a PIC16F microcontroller. Schematics and PIC code in my HBC-56 repo. https://github.com/visrealm/hbc-56

If you're keen to add a VDP as u/production-dave suggested, I have schematics and a bunch of code in my HBC-56 GitHub repo

Schematics are here https://github.com/visrealm/hbc-56/tree/master/schematics/6502

The schematics for my TMS9918A display card are in my github repo. It uses a single SRAM instead of the original DRAMs. The circuitry between the TMS9918A and the TV is just a simple transistor follower circuit (shown in the schematic): https://github.com/visrealm/hbc-56/tree/master/schematics/tms9918

So this is really just cobbled together from this project by u/visrealm https://github.com/visrealm/hbc-56

I've actually just ordered the perix perrino 409 that sends the AA after self test. The HP keyboard definitely doesn't seem to be working. My plan is to interface it with a PIC microcontroller by copying the setup here: https://github.com/visrealm/hbc-56. from u/visrealm

It looks like a shift register can be used in connecting a NES controller but likely isn't the full story. Check out u/visrealm's HBC build. He uses separate shift register chip to connect to a NES but maybe the 6522 can be used in a similar way.

It's Assembly. https://github.com/visrealm/hbc-56/tree/master/code/6502/mandlebrot

I have most schematics, software, emulator, etc on github. https://github.com/visrealm/hbc-56

These are for a 6502 build. https://github.com/visrealm/hbc-56

I put my board on github last night - https://github.com/Individual-Solid/f1microcomputer/blob/main/6502helper/ref/sch.pdf. Pins 23&24 on the two VIAs are swapped so if you fab it as drawn it will not work. I'm currently designing a revision that a) works and b) breaks out the full address/data busses for experimentation.