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General Category => Technical support - Hardware related => Topic started by: handyandy69 on 23:06, 27 May 16

Title: CPC464 Boots but Keyboard Unresponsive
Post by: handyandy69 on 23:06, 27 May 16
Hi, got a CPC464 off ebay as part of a bigger bundle.  I knew it didn't work so I thought i'd have a go at fixing it.


The computer boots ok but goes on to type '93RUN" 781200" on the command line, obviously tries to enter it and comes up with Syntax Error. The keyboard is unresposive.


Another forum suggested I change the AY sound chip which I did but I still have the same problem.


Any ideas?


Cheers,




Andy.
Title: Re: CPC464 Boots but Keyboard Unresponsive
Post by: VincentGR on 01:02, 28 May 16
If you check the socket, remove the keyboard and boot without it and still gives you that then as bryce will say it is the sound chip.
Title: Re: CPC464 Boots but Keyboard Unresponsive
Post by: Bryce on 08:37, 28 May 16
Quote from: VincentGR on 01:02, 28 May 16
If you check the socket, remove the keyboard and boot without it and still gives you that then as bryce will say it is the sound chip.

Almost correct :) There are two types of the AY available if you have used the wrong type you could still have problems and you'd need to add the pull-up resistors. Also, have you had a joystick connected to the CPC at the time or does this also happen with no joystick attached?
However, I suspect if just dirt on the membrane, you probably just need to give it a clean.

Bryce.
Title: Re: CPC464 Boots but Keyboard Unresponsive
Post by: Andy Birch on 20:55, 28 May 16
No joystick was attached and it still does it with the keyboard disconnected.

Think it's probably going to have to sit on the 'For Parts' pile.

Cheers,
Title: Re: CPC464 Boots but Keyboard Unresponsive
Post by: Bryce on 08:58, 30 May 16
Then you most likely have the wrong type of AY installed. You just need to swap it for the correct type.

Bryce.
Title: Re: CPC464 Boots but Keyboard Unresponsive
Post by: VincentGR on 12:53, 30 May 16
My heart breaks when I read the word "parts"  :'(
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