Last Updated or created 2025-09-21
A new “old” book, printed via Lulu
Plexiglass case for my collection of motherboards (8088,8086,386 and 486)
See this post:
A Ben Eater 6502 add-on, A bus monitor using ULN2803A.
Not all green/yellow wires are drawn. You can figure out where to add them.
I made these on a breadboard long ago, these will be made on permboards. (Like my Clock module on steroids.
ULN2803 will draw nearly no power from your bus, but they invert the signal, that’s why I rotated the ledbars and attached them to VCC.