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Title: CPC 464 mpt working
Post by: TronXP on 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:

(http://s27.postimg.org/d5zlee2s3/WP_20141010_001_1.jpg)

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

Any suggestions?

Thanks

Title: Re: CPC 464 mpt working
Post by: Devilmarkus on 11:49, 10 October 14

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

Title: Re: CPC 464 mpt working
Post by: Bryce on 13:05, 10 October 14

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

Bryce.

Title: Re: CPC 464 mpt working
Post by: TronXP on 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

Title: Re: CPC 464 mpt working
Post by: Devilmarkus on 13:39, 10 October 14

For a quick test you can also try the Z80 from your 464+ ;) Just to check if it works...

Title: Re: CPC 464 mpt working
Post by: Bryce on 13:39, 10 October 14

Zilog Z0840004psd Z80-CPU 1 Piece With Holder Vintage Chip 8722 | eBay (http://www.ebay.co.uk/itm/Zilog-Z0840004psd-Z80-CPU-1-Piece-With-Holder-Vintage-Chip-8722-/291262856566?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43d09e7d76)

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.

Title: Re: CPC 464 mpt working
Post by: Devilmarkus on 13:41, 10 October 14

Should work, too:

1 PC. SGS Z8400AB1 8-bit CPU / MPU Z80ACPU Z80A DIP/DIL 40 | eBay (http://www.ebay.co.uk/itm/1-PC-SGS-Z8400AB1-8-bit-CPU-MPU-Z80ACPU-Z80A-DIP-DIL-40-/221428609784?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item338e2c72f8)

Title: Re: CPC 464 mpt working
Post by: Bryce on 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 (http://www.ebay.co.uk/itm/1-PC-SGS-Z8400AB1-8-bit-CPU-MPU-Z80ACPU-Z80A-DIP-DIL-40-/221428609784?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item338e2c72f8)

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

Bryce.

Title: Re: CPC 464 mpt working
Post by: Devilmarkus on 13:48, 10 October 14

Or in TotO's shop:

CPU - Cent Pour Cent (http://www.centpourcent.net/store/p45/CPU.html)

Title: Re: CPC 464 mpt working
Post by: TronXP on 13:48, 10 October 14

Thank you very much guys for your quick response.

I shall order one up and see how it goes ;D

Title: Re: CPC 464 mpt working
Post by: Devilmarkus on 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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General Category => Amstrad CPC hardware => Topic started by: TronXP on 11:40, 10 October 14