Z80 processor

ZX80 / ZX81 hardware and software requested for either sale or swapping
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Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Z80 processor

Post by Lardo Boffin »

Hi all

I have a zeddy with a dead Z80 processor. Given that pokemon is having a well earned holiday from Sell My Retro anyone know a reliable source of Z80s for the zeddy?

Thanks!
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
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Paul
Posts: 1511
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Z80 processor

Post by Paul »

Very reliable is reichelt.de who ship worldwide.
Also worldwide shipping is eBay seller
https://www.m.ebay.de/sch/i.html?sid=gc ... rue&_pgn=1
Who has good prices and is also very reliable.
And last but not least:if we are talking about a single item I would send you a Z80 free of charge.
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: Z80 processor

Post by Lardo Boffin »

Thanks Paul.

I need several as I have been borrowing Z80s out of my ZX81s to fix the ones I have refurbished. I have had three dead on arrival zeddies this year and all three had broken Z80s. All the ULAs were fine. :shock:

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
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1024MAK
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Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Z80 processor

Post by 1024MAK »

Zilog still make the CMOS versions. They are stocked by Farnell and RS.

You will also find Z80 CPUs on eBay. Both new old stock 2.5MHz Z80 NMOS through to “20MHz” “CMOS” ones. Just keep in mind that some are remarked (being marked as a higher speed than what they were originally labelled as, or being NMOS and not CMOS) but despite this, they should be okay for use in Sinclair computers.

Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp

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Lardo Boffin
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Joined: Sat Nov 26, 2016 2:42 am

Re: Z80 processor

Post by Lardo Boffin »

Thanks Mark. Would a Spectrum Z80 work ok?
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
User avatar
Paul
Posts: 1511
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Z80 processor

Post by Paul »

Lardo Boffin wrote: Wed Nov 28, 2018 4:49 pm Thanks Mark. Would a Spectrum Z80 work ok?
Not necessarily. Spectrums are quite tolerant. But if the spectrum Z80 is fine then yes, it's going to work.
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
User avatar
1024MAK
Posts: 5102
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Z80 processor

Post by 1024MAK »

Lardo Boffin wrote: Wed Nov 28, 2018 4:49 pm Thanks Mark. Would a Spectrum Z80 work ok?
Yeah, the ZX Spectrum (all versions) and the ZX80 / ZX81 / TS1000 / TS1500 etc. all use a Z80 rated at 4MHz (the original Zilog NMOS type number was ‘Z80A’). As far as I know, all of these machines were only ever fitted with 4MHz NMOS Z80 chips.

So yes, a Z80 from a ZX Spectrum should work.

I just want to clarify something I said in my earlier post. The first Z80 CPUs were only rated at 2.5MHz. Officially these are not fast enough to work in Sinclair computers.

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.
dessony
Posts: 342
Joined: Tue Oct 29, 2013 2:26 pm
Location: Indiana, USA

Re: Z80 processor

Post by dessony »

Don't forget TS2068. That computer also has its Z80.
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: Z80 processor

Post by Lardo Boffin »

I ended up getting a couple from here

https://www.retroleum.co.uk/zx-spectrum-chips

Ideal if you only need one or two - no minimum order value surcharges. :D
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
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