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Re: Issue 4B Spectrum with dot crawl in black and white

Posted: Wed Dec 19, 2018 8:06 pm
by Lardo Boffin
Thanks Mark. I had seen these on eBay.

https://www.ebay.co.uk/itm/20x-Monolith ... %7Ciid%3A1

Would they be suitable? Hoping yes but they only cost a couple of quid so no worries if not. :D

I can’t see any posting dates on spectrum for everyone. I could ask Adam.

Re: Issue 4B Spectrum with dot crawl in black and white

Posted: Wed Dec 19, 2018 9:06 pm
by 1024MAK
They look fine.

Mark

Re: Issue 4B Spectrum with dot crawl in black and white

Posted: Wed Dec 19, 2018 9:18 pm
by Lardo Boffin
:D

Re: Issue 4B Spectrum with dot crawl in black and white

Posted: Fri Dec 21, 2018 1:29 am
by Lardo Boffin
Fitted the new caps and it certainly reduced the jail bars. It made little difference to the stability of the black however.
I tried another identical ULA from a work in progress Spectrum (a 4S) and it made no difference. I also put back the original Z80 (that I removed to make the DIVMMC work) and that made no difference.
There are no obvious signs of a lower RAM chip having been replaced.
I’m using a modern PSU.
The stability is a lot better on other tellies but still not as good as my other Spectrums.
I guess its possible its always been like this but with the RF quality it was never obvious.
Looks like I will be keeping this one!