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Re: [N8VEM-S100:5571] SCC and Z80/8086 monitor



Hi Rich --

Good to hear that somebody has gotten the serial card to work.

Followed your excellent discussion of P60 + P62 connections (thanks!), until I got to this:

>>  P60-1  to  P60-2
>>  P60-3  to  P60-4
>>  P62-2  to  P60-6
>>  P62-4  to  P60-8
>>  P60-1  to  P62-1 (this means two wraps on P60-1)
>>  P60-7  to  P62-3
>>  P62-8  to  P62-5

Maybe I'm not understanding your numbering scheme?  P60-1 to P62-1 connects DTR from the SCC to pin 2 of the serial cable (either Rx or Tx)???  And, P62-2 to P60-6 connects Rx of the SCC to pin 5 of the serial cable (normally ground???).  Is that right?  And signal ground ought to go to pin 5 of the serial cable, so I see the "problem" with the ground connection on P57.

This is what I get for the connectors (P60 and P62) from the schematic.  I've added in the "standard" DB-9 signal names and pin numbers above (and below) the cable part of P60 and P62.

   1   3   5   7
  DCD  Tx Gnd RTS     Rx DCD Gnd RTS
+------------------+------------------+
|  2   4   6   8   |  2   4   6   8   |
|       cable      |       chip       |
|                  |                  |
|         P60      |        P62       |
|                  |                  |
|        chip      |       cable      |
|  1   3   5   7   |  1   3   5   7   |
+------------------+------------------+
  DTR  Tx Gnd CTS     Rx DTR DSR CTS
                      2   4   6   8

So, I would guess put a jumper at position 1 (numbered left to right, position 1 to 8), 3, 4, 6, 7 and 8???  And maybe cross Tx and Rx (P60-3 to P62-1 and P60-4 to P62-2)????  Maybe do something between pin 10 and pin 5 of P57 to get signal ground to conductor 5 of the serial cable???

All very confusing.

Roger