Red Baron & Mathbox?

Okay,

Me & Red Baron are duking it out again.

I did a ROM checksum & this info may be handy....

3000-37FF = B/C3 = $4C27
3800-3FFF = A3 = $FD11

4800-4FFF = *1 = $65BF
5000-57FF = E1 = $6EA1
5800-5FFF = *2 = $24D9
6000-67FF = J1 = $4BBB
6800-6FFF = K1 = $576F
7000-77FF = L/M1 = $0FFD
7800-7FFF = N1 = $39B1

The 2532 EPROM appears at *1 & *2, you need to add the checksums together to
get the chip checksum.

Anyhow,

I'm doing the signature analysis of this. Step 1. I cannot get the proper
signature from some of the bipolar PROMs, yet the input signatures are good,
the PROMs verify good & I've used atleast 3 different PROMs with the same
results. I can even remove the offending pin from the circuit & get the
same wrong SA.

I've changed the bit slicers too, same results.

What should I be looking for now?

Thanks,
Kev

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Received on Mon Oct 30 13:04:33 2000