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Re: Spectrum 48K Upper Ram Fault
Posted: Fri Feb 19, 2021 8:31 pm
by hatman72
Ha, typo - good spot!!
Re: Spectrum 48K Upper Ram Fault
Posted: Fri Feb 19, 2021 11:16 pm
by 1024MAK
I was wondering, but as you said it was working...
Mark
Re: Spectrum 48K Upper Ram Fault
Posted: Sat Feb 20, 2021 12:59 am
by hatman72
Hi Mark
Yes, all working. Thanks so much for your help and advice.
I think I know what was causing the problem too. I have two power supplies; one is a variable voltage one and the other is a Sinclair UK1400 that was faulty. As the Sinclair PS was faulty I hadn’t been using it, but I repaired it and must have used it when the speccy came back to life. When I picked up the variable voltage power supply today I noticed it was set to 12V, so I suspect I had been over doing it. I was probably lucky I didn’t do any serious damage!
It is working well on both power supplies now. I still suspect the ULA is iffy as it has a tendency to go black-and-white every so often, can crash after a while if I don’t have a heat sink on it, and the diagnostic tests regularly tell me the ULA is faulty. I’ll probably get a new one but I didn’t want to spend the money unless I had sorted the RAM out, and that seems to be ok now.
Cheers!