Need H-89 serial port docs...

Gene Buckle geneb at deltasoft.com
Wed Sep 17 16:17:23 CDT 2008


>> I've got one of the three port H-89 serial boards and I think I've got the
>> connector for port 330 wired incorrectly.
>>
>> The CD bit is never set even when carrier is present (cable and modem
>> known good).  Does anyone out there have the pinouts for the card-end of
>> the internal RS-232 cable that I could get a copy of?
>
> According to my Z90 schematics (same machine AFAIK). the wriing for the
> intenal serial port cables is the same for all 3 ports -- the difference
> between DTE and DCE wiring is on the PCB. I'll specifically give the one
> for the DTE port at addresses 330-337 :
>
> P605 (PCB connector)   DB25
> 5 ---- Rx Data --------3
> 9 ---- CTS ------------5
> 11 --- DSR ------------6
> 15 --- DCD ------------8
> 3 ---- Tx Data --------2
> 7 ---- RTS ------------4
> 14 --- DTR ------------20
> 13 --- Sig Gnd --------7
> 1 --- Prot Gnd --------1
>
> According to the scheamtic, The DCD pin on the DTE connector goes to pin
> 15 on P605, then via L617 to section b (pin 4) of U609, a 1489 chip. The
> output of that (pin 6) goes to RLSD/ (pin 38) on U604, an 8250.
>

Fantastic!  Thank you very much Tony!

g.

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