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Old 13th Oct 2021, 6:54 pm   #73
retromit
Pentode
 
Join Date: Oct 2021
Location: Falkirk, Scotland, UK
Posts: 140
Default Re: Commodore PET 2001 voltage regulators

Quote:
Originally Posted by ajgriff View Post
Does the label above the keyboard say 3016 Series and the label on the back 2001-16N Tim? If so it might explain the aftermarket socketing as illustrated in your earlier photo of the board's underside. In other words someone may have upgraded the RAM from 16K to 32K and fitted sockets (except for one!) at the same time. Also the unsocketed chip looks to have been rather untidily soldered in position. Out of interest what did the machine quote as the available RAM when it was working, albeit briefly? As Sothie says the 416C and 4116 are pin compatible.

By the way my favourite contender for the intermittent power supply fault is the pin 4 connector in JP8.

Alan
Hi Alan. I've attached a couple of pictures of the front/back. It's a 2001 series, and the label at the back notes it as a 2001-16N BS. So it could be, as you suggested, upgraded. It was very brief (and just the once!) when the Commodore screen was displayed, and as far as I remember it was around 32k (minus some bytes). It does look a bit of a mess around the RAM area; it does seem that they were having a few problems!

Tim.
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