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ajgriff · 13th Oct 2021, 12:34 pm

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

13th Oct 2021, 12:34 pm	#69
ajgriff Nonode Join Date: May 2004 Location: Halifax, West Yorkshire, UK. Posts: 2,587	Re: Commodore PET 2001 voltage regulators 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