Subject: Re: modem and IIgs question
From: [email-masked] (David Empson)
Date: Sat, 12 Aug 1995 06:48:39 GMT
Newsgroups: comp.sys.apple2.comm

In article <[email-masked]>,
Tony Hunt <[email-masked]> wrote:
> 
> Would you be able to either post this information or send me the file
> also as I too would like to use a 28.8k modem with a //GS but would
> rather build the cable than try to find one.

Here is the pinout of the hardware handshake cable.

IIgs pinout (Mini-Din-8): looking at the back of the plug, or the
socket in the IIgs:

8 7 6
5 4 3
 2 1

IIgs           Modem 
Mini-Din-8     D25M    Function

1 HshkOut      4,20    RTS and DTR
2 HshkIn       5       CTS
3 TxD-         2       TxD
4 Ground       7       Ground
5 RxD-         3       RxD
6 TxD+  (not connected at modem)
7 DCD          8       DCD
8 RxD+  (connect to ground, i.e. pin 4 at IIgs or pin 7 at modem)

Most modems use a D25 connector.  Pocket modems may use a D9 (9-pin)
connector.  I'm not sure what pinout this connector uses.

The DTR connection (pin 20) is optional.  It allows the modem to be
used in non-handshaking mode with the IIgs output signal going to DTR,
allowing it to be used to hang up (AT&D2).

If using hardware handshaking, you must include &D0 in the
initialization string, to ensure that the DTR input will be ignored.
-- 
David Empson
[email-masked]
Snail mail: P.O. Box 27-103, Wellington, New Zealand