Running Apple 1 software on a breadboard computer (Wozmon) [video]

• 6502

  6 284 7.5 Assembly

  Code for the 6502 microprocessor, mostly for the Replica 1 computer.

The Apple 1 ROM is quite a tight piece of coding. Just 256 bytes which implements basic console IO, and memory editing in hex. And still two bytes left over.

One version with lots of comments: https://github.com/jefftranter/6502/blob/master/asm/wozmon/w...

You can see a classic assembly language space optimizing trick at PRBYTE. It first prints the upper half of the byte in hex with call to the PRHEX procedure, then falls through to PRHEX again to print the second half. Two entry points to a common routine.

• RC6502-Apple-1-Replica

  2 136 0.0 HTML

  An expandable SBC-version of the Apple 1 computer, easy to get started with and lot of cool stuff that can be added to it!

If you fancy playing along on a PCB, there's a mini backplane and SBC version here:

https://github.com/tebl/RC6502-Apple-1-Replica

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