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SiriusHardware · 14th Feb 2020, 11:23 am

If you take the machine back to your soldering guru I would definitely ask him to replace the IC sockets, especially the one the keyboard 6520 sits in, but ideally all of them. There have been several occasions now when taking one lot of socketed ICs out of the machine and putting another lot in have changed the behaviour of the machine, sometimes for the worse, sometimes better, but even then only temporarily.

I strongly suspect that it is the sockets rather than the ICs which are causing your intermittent problems, but the keyboard connector has also been stressed quite a bit lately (unplugged / plugged in / unplugged / plugged in) and maybe the solder joints around the connector pins are starting to crack so get those checked and redone as well.

14th Feb 2020, 11:23 am	#107
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Commodore PET 3016 If you take the machine back to your soldering guru I would definitely ask him to replace the IC sockets, especially the one the keyboard 6520 sits in, but ideally all of them. There have been several occasions now when taking one lot of socketed ICs out of the machine and putting another lot in have changed the behaviour of the machine, sometimes for the worse, sometimes better, but even then only temporarily. I strongly suspect that it is the sockets rather than the ICs which are causing your intermittent problems, but the keyboard connector has also been stressed quite a bit lately (unplugged / plugged in / unplugged / plugged in) and maybe the solder joints around the connector pins are starting to crack so get those checked and redone as well.