Specifically, I'm after a Z84C0004PSC. I'm troubleshooting a Lexicon PCM70 and I'm pretty sure the slave processor is kaput.
To the tech-types here... there are quite a few variations on the Z80, should I be sourcing this exact (vintage) version, or would a modern equivalent such as the Z84C0010PEG (or similar) be suitable?
Thanks!
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Looking for a Z80 CPU
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Looking for a Z80 CPU
wez prictor
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
-
wez - Valued Contributor
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- Location: Slightly to the left.
Re: Looking for a Z80 CPU
What is the speed of the clock that is driving that processor? You will need a Z-80 that is rated for that speed or better. That's the most important number to consider, a 2 Meg Z80 won’t work on a circuit that is running a 4 Meg crystal for example.
Steve Jones
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Thirteen - TRM Endorsed
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Re: Looking for a Z80 CPU
Hey thanks Steve... yep looks like the slowest modern version is 6 Mhz so no problems there. The master and slave CPUs are fed by a 3.25 Mhz clock.
I actually emailed Zilog and got a response the next day -
"You can jump to the next speed which is 6/8/10 MHz version (Z84C00 06/08/10 PEG) version, as long as you’re compliant with the AC timing specifications."
So that sounds promising... although I must admit I don't know if the "AC timing" part of that advice is going to be an issue or not (I have no experience at all with CPU replacement).
I just now noticed that the modern version (Z84C0010PEG) is "ROMless"... not sure if that's what I want?
Anyway it's only a $10 part so will just drop one in and see (unless someone is going to tell me that things might explode).
I actually emailed Zilog and got a response the next day -
"You can jump to the next speed which is 6/8/10 MHz version (Z84C00 06/08/10 PEG) version, as long as you’re compliant with the AC timing specifications."
So that sounds promising... although I must admit I don't know if the "AC timing" part of that advice is going to be an issue or not (I have no experience at all with CPU replacement).
I just now noticed that the modern version (Z84C0010PEG) is "ROMless"... not sure if that's what I want?
Anyway it's only a $10 part so will just drop one in and see (unless someone is going to tell me that things might explode).
wez prictor
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
-
wez - Valued Contributor
- Posts: 1259
- Joined: Fri May 06, 2005 10:38 pm
- Location: Slightly to the left.
Re: Looking for a Z80 CPU
Got the replacement, dropped it in, working PCM-70. Happy camper.
wez prictor
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
composure music
http://www.composuremusic.com.au/
Australian importer of Crumar Mojo keyboards & accessories. Vintage keyboard fetishist.
-
wez - Valued Contributor
- Posts: 1259
- Joined: Fri May 06, 2005 10:38 pm
- Location: Slightly to the left.
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