mecha
Well-known member
yes, that's why I always suggest replacing those first lolI was just fixing a Defender board the other day and I ended up replacing the 7474s at 3J and 3L. I had a good 12Mhz clock but no CPU clock. Board was watchdogging. The clock was getting lost between the 2 7474s. I was in the same state, no video and all 4 LEDs were on solid.
YMMV
Ken Graham wisdom years ago indicated that they were pushed to their limits. except now they're over 40 years of age, not just 30 years, so it may happen more. I find it intriguing how many of these games just had 4116s swapped around 800 times and the rest of the boards are still untouched otherwise.


