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

Roger —

It is indeed very confusing. When I refer to 1-8 from left-to-right I view each odd-even pair as a unit. So, my "0-1-0-1=1-0-0-1 (1=jumper, 0=none)" would correspond to the 1-3-5-7=1-3-5-7 pins in your diagram and matches the picture on the S100 Web site. For simplicity I just numbered them 1-8…like a dip switch.

Your configuration seems right but you do have to cross-jumper Rx and Tx. I believe pin 10 on the connector is already grounded…check with a continuity meter.

To solve the cross-pinning and such, I just made a custom connector using a 2x5 header and pins and a serial cable with one connector cut off and the jumpers configured as shown above.

Rich

Rich Cini

Collector of Classic Computers

Build Master and lead engineer, Altair32 Emulator

http://www.classiccmp.org/cini

http://www.classiccmp.org/altair32

From: S100-Post <n8vem...@googlegroups.com>
Reply-To: S100-Post <n8vem...@googlegroups.com>
Date: Thursday, November 13, 2014 at 6:21 PM
To: S100-Post <n8vem...@googlegroups.com>
Subject: Re: [N8VEM-S100:5575] 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

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