CPC 464 mpt working

TronXP · 11:40, 10 October 14

Hello, I am looking for some help.

I recently got my CPC 464 and 464+ out of the attic and have tried to get them to work. My 464+ works however my 464 does not.

The 464 sometimes shows nothing on the screen, other times it does this:

I have checked the voltage from the monitor and its healthy and the red light does appear on the keyboard.

Any suggestions?

Thanks

Devilmarkus · 11:49, 10 October 14

I once had the same problem.
Then I swapped the Z80 CPU and it worked fine after.

Bryce · 13:05, 10 October 14

Hi TronXP,
I 2nd that. Looks like the Z80 has failed.

Bryce.

TronXP · 13:07, 10 October 14

I had a quick look on ebay for z80 chips, is there a specific one I need to look for?

thanks

Devilmarkus · 13:39, 10 October 14

For a quick test you can also try the Z80 from your 464+

Just to check if it works...

Bryce · 13:39, 10 October 14

Zilog Z0840004psd Z80-CPU 1 Piece With Holder Vintage Chip 8722 | eBay

A bit expensive, but what you are looking for. Important stuff: Make sure it's a 4Mhz or 6Mhz version. NMOS ones were only 2.5Mhz. Make sure it's a Z80 CPU and not a Z80 PIO / UART / CIA or other Z80 interface chip.

Bryce.

Devilmarkus · 13:41, 10 October 14

Should work, too:

1 PC. SGS Z8400AB1 8-bit CPU / MPU Z80ACPU Z80A DIP/DIL 40 | eBay

Bryce · 13:43, 10 October 14

Quote from: Devilmarkus on 13:41, 10 October 14
Should work, too:

1 PC. SGS Z8400AB1 8-bit CPU / MPU Z80ACPU Z80A DIP/DIL 40 | eBay

Didn't spot that one. Yeah, that would be fine too.

Bryce.

Devilmarkus · 13:48, 10 October 14

Or in TotO's shop:

CPU - Cent Pour Cent

TronXP · 13:48, 10 October 14

Thank you very much guys for your quick response.

I shall order one up and see how it goes

Devilmarkus · 13:49, 10 October 14

Much luck

Probably you really should first try the Z80 from your CPC+

When your 464 works fine then, order one

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CPC 464 mpt working

TronXP