The continuity is fine between the ROMs and IC31 and IC30.Yes, that's a problem. On all ROMs?So, pin 2 is the same as pin 3. Is that a problem?
pin 3 on every ROM should be the same as pin 12 on IC31. Check for continuity from IC31 pin 12 to pin 3 of each ROM.
Likewise, pin 29 on every ROM is connected to pin 18 of IC30 - check for continuty all ways.
I can confirm that pin 12 IC31 is 122Hz just as pin 2 & 3 are 122Hz on each ROM.
Statistics: Posted by Kepler — Sat Sep 28, 2024 9:50 pm