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Found these inside a non-working 71B
03-17-2018, 11:57 PM
Post: #133
RE: Found these inside a non-working 71B
No solder jumpers were removed by me.

Trying to keep it simple.

I assume it was working at one time. So, I assume the main wiring was correct and what I'm using (1-7, 8 and pin13). Took photos to preserve original wiring.

All other chips seem to work fine, including the 71B. So, nothing traumatic happened to it.

Either there is something I'm misunderstanding about this or the FORTH might be dead. I've wired it in the port 0 string and when it's there, the 71B shows no signs of life. Nothing on display. When I put it in my other 71B as a port device (port 4), I see a frozen cursor and no other sign of life. Hard wiring it as Port 4 chip seems to suggest it's dead. Pin 12 us connected to pin 13, and pins 10, 11, 12 are assigned on port. I dont have thise wired. wonder if they are needed. Can't hurt to try at this point.

Not looking good.
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What's U10? - Dave Frederickson - 03-15-2018, 03:43 PM
RE: Found these inside a non-working 71B - MikeSD - 03-17-2018 11:57 PM

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