Found these inside a non-working 71B
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03-15-2018, 05:26 PM
Post: #101
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RE: Found these inside a non-working 71B
(03-15-2018 05:09 PM)MikeSD Wrote: If I said that, I must have been tired. I think the only place I used 10 is that the U9-9 is routed to the Math ROM-8 and also to pin 10 on U9, for some reason. Mike, You didn't call that part U10, I did. Schematically speaking, it needs a reference designator. U10 is just the next number in the series. Yes, the F/A module was later marketed with a debugger, but it's software. The physical ROM is the same. The IDS, however, mentions a hardware Debugger ROM several times. I suspect that U10 is where it was to be installed. Also of interest, the Service ROM contains a debugger very similar to the 82478A Debugger, but it's undocumented(!) Dave |
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