Chicago, IL
Reseat sound Microprocessor U11
No?
Swap Microprocessors U11 and U17
No?
Check pin 6 on sound U11 microprocessor is logic high
No?
Check for a cracked SR 10
(Topic ID: 324696)
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Quoted from sidetrackedbrew:Thank you PINTEC. Reseating u11 gave no change; swapping u11 and u17 made the machine not boot at all. (Swapping them back returned the machine to the state in the video.) Does this indicate that one of those microprocessors is bad? Should I just replace them both? SR10 looks brand new.
Could be a 6802 processor at 1c 17 not a 6808 as at 11
place Ic 17 Processor back into socket 11 (leave 17 out) power up then press the sound test button
Does the sound loop play now when requested?
Quoted from sidetrackedbrew:They are both 6808 processors. If I place the processor from u17 into u11 and leave u17 out, machine powers up with just general illumination, and the sound loop plays when SW2 is pressed.
Suspect IRQ corrupt
Replace microprocessor 11 with a fresh 6808
Quoted from sidetrackedbrew:Turns out I do have a couple MC6802p's at work; can I use one of those in u17 instead of ordering another 6808?
This cpu is set up for 6808 then yes 6802's will work in place of them as the 6802's added internal ram is not enabled so it will run as a 6808.
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