ZX81 Enhanced ULA replacement module.

ZX80 / ZX81 hardware and software offered for sale or swapping
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Andy Rea
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Re: ZX81 Enhanced ULA replacement module.

Post by Andy Rea »

Afraid not, the cold that is used is quite expensive, I was at the time able to get hold of a few for very reasonable price.

Regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
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PokeMon
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Re: ZX81 Enhanced ULA replacement module.

Post by PokeMon »

Yes - the CPLD used is EOL, I think. But using other CPLDs from Altera would be possible with the same number of macrocells (128).

http://www.mouser.de/ProductDetail/Alte ... 55v6LKo%3d

It is 1.8V power voltage but this was only a quick search to see price for these devices. I think 3.3V power with 5V tolerance chips may be available, not 100% sure. This device would be around 4 EUR/GBP in a QFP64 - are 54 IOs enough ?

I find your ULA quite brilliant, ULA's are rare by now (if somebody doesn't find a new old stock somewhere in a garage) and maybe there could be integrated more features like UDG or something similar. I am just thinking around. But it is a great pity to leave this in a drawer. ;)
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Andy Rea
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Re: ZX81 Enhanced ULA replacement module.

Post by Andy Rea »

Yes it may be possible, lattice seem to still do a few 5v parts so maybe that could be an option if someone wants to pick up the gauntlet

Regards Andy
Last edited by Andy Rea on Sun Mar 26, 2017 12:03 am, edited 1 time in total.
what's that Smell.... smells like fresh flux and solder fumes...
Tezz
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Re: ZX81 Enhanced ULA replacement module.

Post by Tezz »

It would be great to have these available again, I'm missing a couple of ULAs so I'd certainly be in for a few.
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Andy Rea
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Re: ZX81 Enhanced ULA replacement module.

Post by Andy Rea »

Shhhh - keep it under your hat..... but I've heard from a very reliable source that a certain mad scientist that frequents these boards is actually working on a new alternative ULA....

Regards andy
what's that Smell.... smells like fresh flux and solder fumes...
Tezz
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Re: ZX81 Enhanced ULA replacement module.

Post by Tezz »

That's excellent news :) I'll keep a couple of boards back for them.
Moggy
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Re: ZX81 Enhanced ULA replacement module.

Post by Moggy »

Andy Rea wrote: Sun Mar 26, 2017 12:01 am Shhhh - keep it under your hat..... but I've heard from a very reliable source that a certain mad scientist that frequents these boards is actually working on a new alternative ULA....

Regards andy
Not a mad midlander by any chance? If so then bostin!
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