28-11-2025, 04:56 PM
Quote:I swapped out C52 and now I'm getting a high on the reset line.
Should I swap out C43 or is that okay?
C43 was at 4.7v and C52 is at 2.2v.
I'd leave C43 - it seems o.k. C52 was the culprit.
Now you can check the address, data & control lines to see what action you have. Check the ROM Chip select as well, to see if it cycles up from address 0h to 8000h where the boot rom sits in memory.
The preferred input voltage to the computer is 10V but it will work down to 8v o.k. 12v is acceptable, but it has to disipate more heat out of the 7805 regulators.