/vr/ - Retro Games

>>6417702
>>6417673
>>6417665
One of the guys at the repair shop made a note of how you need to put in a bigger capacitor to replace one Atari was using or you'll get those random power-up failures. (It's also by coincidence one of the first things I encountered by first time using digital logic circuits.)

Instead of the NE555, you can get most of the way there by bumping the value of the 4.7µF capacitor (C201) up a bit. Try 10µF or so. If you're not having any luck, replace the stuff wired to pin 1 on the CPU with the NE555 circuit from a late 2600A and that should 100% fix the issue (but it's more invasive).