Sinclair ZX80 / ZX81 / Z88 Forums

Hello :) I don't suppose you bought that machine with the kludge and dead ULA from blooda on eBay? I have a funny story if so :D Ian at Mutant Caterpillar Games will have some 2C210E's in stock if you're stuck. Moggy, I didn't realise that was the last 2C158E you had. Now I feel doubly humbled :) B

If the coil is too noisy for your tastes, a little varnish over the windings helps reduce it considerably.

Me, I quite like the buzz

B

Here we go, along with the font required to replicate the stickers exactly.

http://www.bennyalford.com/zx80labels.zip

B

Also vouching for the ZX8-CCB - I've got them running in boards with the three different ULA types also. In fact (as Moggy and PokeMon will know), the one time I couldn't get a CCB to work, the ULA was faulty

B

New GAL's arrived today, and I'm glad to report that after a new EPROM, SRAM and memory GAL, this ZXPand is now fully operational.

Thanks to all who helped, especially SirMorris

B

Got the replacement SRAM today, and the ZXPand boots with just the SRAM and modified Memory GAL, and PRINT PEEK 16389 = 128.

Once the GAL's arrive I'm confident I'll be able to resurrect this one

B

With Sirmorris' help, I've diagnosed the following: - Dead EPROM - Dead SRAM - Dead I/O GAL The PIC and the memory GAL are still good, however. Replacements incoming, however the GAL's are coming from China which will slow the repair work up somewhat. I'll report back when I return to this, but in t...

That would be great, cheers PM incoming...

B

Naturally the only 28C64 I have spare has a fault with its A0 address line

The PSU is good

Seems the SRAM is also bad, so ordered one of those too. The ZXPand is a purely digital board, so I'm fairly confident a new SRAM and EPROM will have it working again.

B

Fwapp wrote:Thanks B, I'll check that out when he sends it down, he doesn't have much luck with hardware (Mick )

Ah, Mick He's cursed

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