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Z80 processor

Posted: Wed Nov 28, 2018 10:25 am
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!

Re: Z80 processor

Posted: Wed Nov 28, 2018 11:51 am
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

Re: Z80 processor

Posted: Wed Nov 28, 2018 12:17 pm
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

Re: Z80 processor

Posted: Wed Nov 28, 2018 12:39 pm
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

Re: Z80 processor

Posted: Wed Nov 28, 2018 4:49 pm
by Lardo Boffin
Thanks Mark. Would a Spectrum Z80 work ok?

Re: Z80 processor

Posted: Wed Nov 28, 2018 4:56 pm
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

Re: Z80 processor

Posted: Wed Nov 28, 2018 6:54 pm
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

Re: Z80 processor

Posted: Thu Nov 29, 2018 7:19 am
by dessony
Don't forget TS2068. That computer also has its Z80.

Re: Z80 processor

Posted: Thu Dec 20, 2018 7:53 am
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