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(Topic ID: 282326)

gottlieb sys 80a semi boots up

By pinnut

3 years ago



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#2 3 years ago
 
GPE

G-P-E

GPE

US Omaha, NE

13y 76,800 2,778 4

Sounds like your clock is running real fast.
If you have a frequency counter - measure the clock rate at pin 9 of Z2. Also check for solder bridges around Z3.

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#4 3 years ago
 
GPE

G-P-E

GPE

US Omaha, NE

13y 76,800 2,778 4

True about the lack of startup delay for an 80A but I think it's more than just the reset at boot up.
The problem with quickly strobing displays and sporatically reading switches sounds like an abnormal clock rate to me. I would start with verifying the clock rate is correct.

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