Subject: Re: >Various ramblings...
To: NetBSD <macbsd-general@NetBSD.ORG>
From: Marc St-Jean <>
List: macbsd-general
Date: 08/30/1995 13:38:53
RE>>Various ramblings...
>I'm almost certain that Macs can't do both hardware handshaking and
>disconnect detect at the same time. The problem is that the DIN8 serial
>connector they use doesn't have enough pins for all of the traditional
>RS232 signals. Specifically, it has DTR and CTS, but it doesn't have DCD,
>DSR or RTS.  (Two of the pins are used for RS422 differential transmission
>and just map to ground on RS232.)
>Most of this is from memory, so I could be wrong.  Does anyone out there 
>have conflicting information?  (I've copied this to the list so others
>can jump in.)

>From what I understand it can do disconnect detect but not hardware hangup.
Macs since the SE (I think) have DCS.  The problem is that DTR must be used
for RTS, so you can't do DTR hangup.

Marc St-Jean  <>
QCC Communications Corporation
114-15 Innovation Blvd.   Tel: 306-249-0220
Saskatoon, SK   S7N 2X8   Fax: 306-249-5128