Not looked at these yet mate.
Thanks for that. I've tried them and they appear to be correct, in at least that they checksum against the ones in my machine.
Bit of a downer really as I was hoping that this was the issue.
The problem I'm having is with the speakers connected I get very loud 'static' noises on both speakers.
I've changed the CPU, checked all the programme/sound eproms but am kinda lost from there on.
If anyone has any suggestions then I'm all ears! :-)
Thanks
Si