...anything out there - anything at all? All the guides and info. I'm finding are for early system 80 board versions (IE, Black Hole, Haunted House - the stuff covered in Clay's old guides and elsewhere), but really coming up dry with anything useful for the later version of the System 80B sound board & aux. sound board. In this case, it's one from a "Big House" - sound effects are working ok, and I think are all there - but no music whatsoever.
Two 6502's on the sound board; one seems specific for the music. I can probe the data lines on the processor, and they're active - but when I probe specific data lines, the processor seems to lock up - everything goes to a logic high - normal sounds still working.
Reset the board using the on-board button, and it's active again. Odd thing is that it's like there's no communication to the aux. sound board - the data lines are never active on the sound chip (forget the part number, and no schematics handy) - they're stuck low. Cable looks ok, but having it checked out to be safe.
Waiting on the manual to come in from PB Resource (scanned manual I have is very poor), but curious whether anybody has any useful repository of basic troubleshooting info. on these boards in the interim, or a complete set of decent quality schematics for it.
Thanks!
Brent
Two 6502's on the sound board; one seems specific for the music. I can probe the data lines on the processor, and they're active - but when I probe specific data lines, the processor seems to lock up - everything goes to a logic high - normal sounds still working.
Reset the board using the on-board button, and it's active again. Odd thing is that it's like there's no communication to the aux. sound board - the data lines are never active on the sound chip (forget the part number, and no schematics handy) - they're stuck low. Cable looks ok, but having it checked out to be safe.
Waiting on the manual to come in from PB Resource (scanned manual I have is very poor), but curious whether anybody has any useful repository of basic troubleshooting info. on these boards in the interim, or a complete set of decent quality schematics for it.
Thanks!
Brent