AY sound issue with Just Speccy 128k

For experts to discuss very technical stuff and newbies to ask why the Spectrum they bought off ebay doesn't work.
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Re: AY sound issue with Just Speccy 128k

Post by 1024MAK » Mon May 14, 2018 1:56 pm

Do you have, or have access to a logic probe or an oscilloscope, or maybe a logic analyser?

If yes, then it should be possible to determine if the system is trying to write data to the AY chip.

If you have a multimeter, you can test the power supply pins of the AY chip.

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Re: AY sound issue with Just Speccy 128k

Post by Toki » Wed May 16, 2018 9:33 am

Yeah, I do have a multimeter.

I was going to have a look over the board at the weekend and get the multimeter on it to see if I could spot anything, but the battery has gone in the multimeter.

*sigh* nothing is ever simple!
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