January 16, 2010

Notes on the Senior Prom reverse engineering:
- The 74LS279 was used in place of the 74LS00 IC because it simplified the logic and wiring
- At the time of this project, no known copy of the //e enhanced Senior Prom firmware was available, so a hybrid version was made by combining the 3.01 Senior Prom firmware for the Apple ][ in the high memory banks of the EPROMs with the full enhanced //e CD/EF firmware in the lower banks.  All testing so far shows the Senior Prom performing exactly as specified with the //e with no issues.