Early Macintosh home brew 4MB memory upgrade board development

[Builder68]

Agreed, that’s a great sign that it should work for this project!

Thanks for sharing this. I saw a blurb in the schematic in the linked GitHub repository talking about using an AND gate to control the ~OE line to the RAM ICs based on either the upper or lower ~CAS lines being asserted rather than just tying ~OE low like I had originally. The purpose for this allowing the use of EDO type RAM if FPM type becomes unavailable.

One more criterion to add to the list for the schematic redraw!

Good Catch! Linking that schematic was worth it!

I have to say, I find the way you use chat very enjoyable, like a kind of log of the thoughts, reflections, and decisions you make for the development of your project; it's much better than the stickers on the corkboard, isn't it?