ZX81 ULA
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ZX81 ULA
Hi. I’ve had a great response from my first post (ZX81 black screen), so thanks to all that took the time. This leads me to my next question : replacement ULA’s ? Are they the proverbial rocking horse poo ? Or is it possible to find one ? My online searches have been quite disappointing. Thanks in advance.
Re: ZX81 ULA
Aren't they a similar price to the real "new old stock" ULAs currently on eBay though (possibly from ZX81 kits that were never built)? This thread should probably be in the hardware subforum.
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Re: ZX81 ULA
There is the vLA81 when available. Other than that it is luck of the draw on eBay for one.
You could of course buy an untested zeddy pretty cheaply and borrow the ULA but then you have another one to do something with...
But the golden rule is that no zeddies get harmed!
You could of course buy an untested zeddy pretty cheaply and borrow the ULA but then you have another one to do something with...
But the golden rule is that no zeddies get harmed!
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Re: ZX81 ULA
Says the man who lights them with fire and hits them with sticks!!
Moggy runs waddles away as fast as his chubby little legs will carry him
Moggy runs waddles away as fast as his chubby little legs will carry him
- 1024MAK
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- Location: Looking forward to summer in Somerset, UK...
Re: ZX81 ULA
I’ve moved this topic to the hardware section.
Although there have been various ULA replacement designs and modules, currently we only know of one that is currently being made. That is the vLA81. See here for where to buy one.
But keep in mind that both the COVID19 Corona virus outbreak and brexit are affecting shipping and deliveries
But once that stock sold, that’s it for new unused ULAs. Unless someone decides to sell off their own spares.
It’s unlikely that any ULAs from unbuild kits will be sold separately, as the unbuilt kits are now considered ‘r@re’ and go for silly high prices on eBay.
Very occasionally, a used ULA may come up on eBay, or on Sell My Retro.
Mark
Although there have been various ULA replacement designs and modules, currently we only know of one that is currently being made. That is the vLA81. See here for where to buy one.
But keep in mind that both the COVID19 Corona virus outbreak and brexit are affecting shipping and deliveries
Actually some years ago (about five I think, could be a bit longer), a box of them (original ULA chips) was found in a warehouse, so for a few months there was a plentiful supply
But once that stock sold, that’s it for new unused ULAs. Unless someone decides to sell off their own spares.
It’s unlikely that any ULAs from unbuild kits will be sold separately, as the unbuilt kits are now considered ‘r@re’ and go for silly high prices on eBay.
Very occasionally, a used ULA may come up on eBay, or on Sell My Retro.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.