ZX81 ULA wanted

ZX80 / ZX81 hardware and software requested for either sale or swapping
Ian13
Posts: 6
Joined: Thu Aug 03, 2017 4:42 pm

ZX81 ULA wanted

Post by Ian13 » Thu Aug 10, 2017 6:05 pm

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

Lardo Boffin
Posts: 626
Joined: Sat Nov 26, 2016 1:42 am

Re: ZX81 ULA wanted

Post by Lardo Boffin » Fri Aug 11, 2017 8:02 am

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
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

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1024MAK
Posts: 1771
Joined: Mon Sep 26, 2011 9:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 ULA wanted

Post by 1024MAK » Fri Aug 11, 2017 8:38 am

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

Ian13
Posts: 6
Joined: Thu Aug 03, 2017 4:42 pm

Re: ZX81 ULA wanted

Post by Ian13 » Fri Aug 11, 2017 4:22 pm

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.

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1024MAK
Posts: 1771
Joined: Mon Sep 26, 2011 9:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 ULA wanted

Post by 1024MAK » Fri Aug 11, 2017 4:46 pm

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

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1024MAK
Posts: 1771
Joined: Mon Sep 26, 2011 9:56 am
Location: Looking forward to summer in Somerset, UK...

Re: ZX81 ULA wanted

Post by 1024MAK » Fri Aug 11, 2017 10:57 pm

A member on World of Spectrum forums has ULAs for sale, see this thread .

Mark

arts
Posts: 2
Joined: Fri Nov 10, 2017 4:46 pm

Re: ZX81 ULA wanted

Post by arts » Fri Nov 10, 2017 4:50 pm

I have a zx81 still in original packaging if anyone is interested

Lardo Boffin
Posts: 626
Joined: Sat Nov 26, 2016 1:42 am

Re: ZX81 ULA wanted

Post by Lardo Boffin » Fri Nov 10, 2017 6:41 pm

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.
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

Moggy
Posts: 1506
Joined: Wed Jun 18, 2008 1:00 pm

Re: ZX81 ULA wanted

Post by Moggy » Fri Nov 10, 2017 8:26 pm

"Do you expect me not to use a heat-sink Moggy?"..."No Mr Lardo I expect you to die!"
Attachments
Goldfinger.jpg
Goldfinger.jpg (36.42 KiB) Viewed 116 times

Lardo Boffin
Posts: 626
Joined: Sat Nov 26, 2016 1:42 am

Re: ZX81 ULA wanted

Post by Lardo Boffin » Fri Nov 10, 2017 9:28 pm

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?

328B6967-D52C-4714-83A3-F946EA9F7E1A.jpeg
328B6967-D52C-4714-83A3-F946EA9F7E1A.jpeg (775.21 KiB) Viewed 104 times
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...
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

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