Peter KreftingSep 28
If a #Commodore64 starts up with an Out Of Memory error, that's probably not a good sign.
Show threadroot42Sep 28
@nafmo what board is inside? Short board? Probably broken RAM.
Show threadPeter KreftingSep 28
@root42 Long board, this is an early model, they stopped selling Swedish C64s when Handic went out of business, IIRC.
Show threadroot42Sep 28
@nafmo With long board it could be multiple issues. What kind of RAM is used?
Show threadPeter KreftingSep 28

@root42 I need to read up on chips to see which one is which.

I don't know the history of this unit, I think my father received it as broken from someone.

Show threadroot42Sep 28
@nafmo they are not μT RAMs. That’s good. Could also be the PLA, Muktiplexers or something else. Needs more analysis, maybe test with DesTestMax and DeadTest /DiagROM.
Show threadPeter Krefting
@root42 Looks like one of the eight RAM chips is uT, according to my colleague, who does hardware, it looks like the other 7 have been swapped at some point.
Oct 2 at 2:29pmWeb
Show threadroot42Oct 2
@nafmo hah! That would explain it! I only saw the good brand!
Show threadPeter KreftingOct 2

@root42 There was also some stuff that had come loose, but soldering that back up didn't help.

We'll try switching the bad chip (at some later point in time) and see if that helps.

I'd really love to have a proper localized C64. They had stopped selling them by the time I bought mine.

Show threadPeter KreftingOct 4

@root42 I've ordered a set of 4164 chips now. Maybe I'll get lucky.

The board shows signs of having been tampered with before, perhaps a previous attempted repair that didn't work?

Show threadPeter KreftingOct 31

@root42 This seems to indicate a single bit failure, which, according to the schematics, matches the one chip that was not the same as the others...

#Commmodore #C64

Show threadPeter KreftingOct 31
@root42 Success! Now the test runs through without issues!
Show threadPeter KreftingOct 31
@root42 it's hard to photograph CRTs with a phone camera...
Show threadroot42Oct 31
@nafmo hard to see the color of the checksums. Are they green?
Show threadPeter KreftingOct 31

@root42 Yes, it's not that easy to see on the small screen I have available at the office.

The old Commodore diagnostic tool didn't like them, though, being the Swedish localisations..

Show threadPeter KreftingOct 31

So, it looks like that Swedish KERNAL EPROM is socketed... Does anyone know if there is a Swedish localized #Commodore64 #JiffyDOS around that one can get from somewhere?

#Commodore

Show threadPeter KreftingOct 31

14 iterations without reporting any errors!

The old PSU started smelling a bit funny, so I think it is best avoided. I bought one from https://www.c64psu.com/ that works like a charm, though.

C64 PSU – Reliable Commodore 64, Amiga & Atari Power Supplies

Safe, reliable replacement power supplies for Commodore 64, Amiga, Atari and ZX Spectrum. Trusted worldwide by the retro computing community.

C64PSU.COM by Electroware
Show threadPeter KreftingNov 1
Finally got around to open my 2017 birthday gift from Mermaid! #PondSoftware #TheBearEssentials #Commmodore64
Show threadPeter KreftingOct 31

That's exactly the same chip that the diagnostic I ran a month ago blamed, BTW.

https://social.vivaldi.net/@nafmo/115288762186806724

But now I have a KFF2 cartridge to play with (I wanted an S-Video cable, and since I had to pay import duties anyway I'd added some more stuff to the order...)

Peter Krefting (@[email protected])

Attached: 1 image @[email protected] This is as far as the diagnostics I found on CSDb got before crashing.

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