ZX81 ULA wanted
ZX81 ULA wanted
Before I decide what to do with my 'half dead' ZX81,(see my post in Hardware) does anyone know if there are currently 'any' responsibly priced ULA's available in the UK?
Thanks
Ian
Thanks
Ian
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- Posts: 2169
- Joined: Sat Nov 26, 2016 2:42 am
Re: ZX81 ULA wanted
Hi Ian
Unlikely - I think most people end up having to buy a cheap donor zeddy on eBay.
There is talk of a new replacement ULA but nothing concrete as of yet. viewtopic.php?f=7&t=2110&start=80
Lardo
Unlikely - I think most people end up having to buy a cheap donor zeddy on eBay.
There is talk of a new replacement ULA but nothing concrete as of yet. viewtopic.php?f=7&t=2110&start=80
Lardo
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
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: ZX81 ULA wanted
Unless another box of them are found (very unlikely now), you will have a job finding a new old stock ULA for sale, let alone one for a reasonable price
See if you can find another ZX81/TS1000.
If you do get another machine, and it works, you can swap the ULAs over and see if the fault symptoms follow the ULA...
If do this and end up with a ZX81/TS1000 board without a working ULA and want to dispose of it, don't throw it away. Instead you can send it to me. I can make use of it.
Mark
![Sad :(](./images/smilies/icon_e_sad.gif)
See if you can find another ZX81/TS1000.
If you do get another machine, and it works, you can swap the ULAs over and see if the fault symptoms follow the ULA...
If do this and end up with a ZX81/TS1000 board without a working ULA and want to dispose of it, don't throw it away. Instead you can send it to me. I can make use of it.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert ![Exclamation :!:](./images/smilies/icon_exclaim.gif)
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
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
Looking forward to summer later in the year.
Re: ZX81 ULA wanted
I was looking at the thread about a modern ULA thats drops in, sounds promising. Mine is not responding the the keypad, other than that it seems to work.I get the Inverse 'K' on the screen. runs bloody hot those. I have re-soldered all of the IC pins and it made no difference.
I may consider getting rid of it,but would want to re-coupe the cost of a recently purchased new keypad.
I may consider getting rid of it,but would want to re-coupe the cost of a recently purchased new keypad.
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: ZX81 ULA wanted
If you get another, you can keep the top half of the case with the new keyboard
If you don't want to buy another ZX81, then I understand what you are saying.
Mark
![Wink ;)](./images/smilies/icon_e_wink.gif)
If you don't want to buy another ZX81, then I understand what you are saying.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert ![Exclamation :!:](./images/smilies/icon_exclaim.gif)
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
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
Looking forward to summer later in the year.
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: ZX81 ULA wanted
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert ![Exclamation :!:](./images/smilies/icon_exclaim.gif)
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
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
Looking forward to summer later in the year.
Re: ZX81 ULA wanted
I have a zx81 still in original packaging if anyone is interested
-
- Posts: 2169
- Joined: Sat Nov 26, 2016 2:42 am
Re: ZX81 ULA wanted
Mutant Caterpillar Games have a bunch of tested (heat sink’d / sunk? Don’t tell Moggy regardless....) ULAs up for sale at the mo on Sell My Retro.
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 wanted
"Do you expect me not to use a heat-sink Moggy?"..."No Mr Lardo I expect you to die!"
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- Posts: 2169
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Re: ZX81 ULA wanted
The names Boffin.... Lardo Boffin, he thought as he watched the ULAaser get dangerously close to bits that’s don’t need to be heated up.
If only my latest gadget from Q-bay can help me?
He wondered where it was best to attach it to the motherboard and how he could do it with only a magnetic Omega while strapped to the table...
If only my latest gadget from Q-bay can help me?
He wondered where it was best to attach it to the motherboard and how he could do it with only a magnetic Omega while strapped to the table...
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