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Re: [N8VEM-S100:5575] SCC and Z80/8086 monitor

Problem solved!

The source of the confusion is that the serial connector pins (P57 and P58) are numbered not as a header, as one might expect, but sort of like an IC (with top row backwards).  I.E. instead of:

2 4 6 8 10
1 3 5 7 9

they are:

6 7 8 9 G
1 2 3 4 nc

(this is when you use a ribbon cable header -- a "DE-9" connector)

So now I understand Rich Leary's suggestions a little better, and I can see that (as he suggested) tha the best way to get ground to pin 5 of the serial cable is with a little jumper across the 2 far right pins.