8/27/23 Update

A project log for 1802 MemberChip Card

A retro-microcomputer in a micro-package. Learn from the ground up, just like the pioneers. Has monitor editor assembler BASIC FORTH LISP...

lee-hartLee Hart 08/30/2023 at 03:250 Comments

More updates to the manual at

I figured out a clever scheme to double the EPROM size (from 32k to 64k) with bank switching. This will allow me to put both the standard and alternate ROMs in at once. Now I'll have to see if there's enough room on the PCB to actually implement it!

Numerous small bug fixes and enhancements have been made to the Alternate ROM software.  Allow tabs in the editor. Handle the illegal 1802 opcode 68h in the monitor and debugger. Add new words to FORTH, etc.