Z80 processor

ZX80 / ZX81 hardware and software requested for either sale or swapping
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Lardo Boffin
Posts: 862
Joined: Sat Nov 26, 2016 2:42 am

Z80 processor

Post by Lardo Boffin » Wed Nov 28, 2018 10:25 am

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!
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

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Paul
Posts: 974
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Z80 processor

Post by Paul » Wed Nov 28, 2018 11:51 am

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: 862
Joined: Sat Nov 26, 2016 2:42 am

Re: Z80 processor

Post by Lardo Boffin » Wed Nov 28, 2018 12:17 pm

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
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

User avatar
1024MAK
Posts: 2162
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Z80 processor

Post by 1024MAK » Wed Nov 28, 2018 12:39 pm

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

Lardo Boffin
Posts: 862
Joined: Sat Nov 26, 2016 2:42 am

Re: Z80 processor

Post by Lardo Boffin » Wed Nov 28, 2018 4:49 pm

Thanks Mark. Would a Spectrum Z80 work ok?
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
Iss 3 ZXVid
TS 1000 iss 3, ZXPand AY, ZX8-CCB, ZX-KDLX & ChromaSCART
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Various Spectrum 48ks plus a DIVMMC future and SPECTRA

User avatar
Paul
Posts: 974
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Z80 processor

Post by Paul » Wed Nov 28, 2018 4:56 pm

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: 2162
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Z80 processor

Post by 1024MAK » Wed Nov 28, 2018 6:54 pm

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

dessony
Posts: 196
Joined: Tue Oct 29, 2013 2:26 pm
Location: Indiana, USA

Re: Z80 processor

Post by dessony » Thu Nov 29, 2018 7:19 am

Don't forget TS2068. That computer also has its Z80.

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