Subject: Re: Apple SuperSerial Pinouts??
From: [email-masked] (David Empson)
Date: 1 Jul 1996 22:35:01 +1200
Newsgroups: comp.sys.apple2

In article <[email-masked]>,
Tony Cianfaglione <[email-masked]> wrote:
> 
>    I have a SuperSerial II card and need the pinouts so that I can get a 
> modem cable to hook up a standard Hayes-compatible modem (db25).

Assuming you have the jumper block on the card pointing to "MODEM",
just use a straight-through cable.  The essential pins are 2, 3 and 7
(data lines and ground).  You should also connect pin 20 (DTR).  Pins
4 (RTS) and 5 (CTS) are required for hardware handshaking.

The flow control lines can get a bit hairy, because of the special
functions assigned by the 6551 chip.  You should probably not connect
anything to pin 8 at computer (DCD), because if this signal goes off,
the computer will not be able to receive anything.

You might like to connect modem pin 8 (DCD) to computer pin 6 (DSR) to
give you a "connected" signal, provided your software supports this
remapping.  If you do this, then don't connect modem pin 6 to anything.
-- 
David Empson
[email-masked]
Snail mail: P.O. Box 27-103, Wellington, New Zealand