Basic Design Goals, v0.2
I’ve wasted like 40 minutes trying to find a 74hc181 or 74hct181. sheesh. I need to sleep……….. And mouser keeps blocking me…
Some more useful things to read, Designing with TTL, from engineers at Fairchild. r/beneater Helpful Tips and Recommendations.
Other links to look at for improvements. eater-sap-1-improvements
And now that that’s over, let’s get to the meat and potatoes. (I really just needed to close a bunch of brower tabs lol).
Real design goals.
- Narrow eeprom design for additional control signals.
In short, you won’t be doing multiple outputs to the bus at the same time, so by using something like a 74HCT138 3-8 decoder, I can turn 3 bits of eeprom into 8 different controls. That’ll save both breadboard space, as well as making far more control signals available. With the SAP-1, you can combine theRO, IO, AO, ΣO, CO, and probably another one or two somewhere.
Heh, I got distracted looking for chips…