Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!lll-winken!unixhub!shelby!msi.umn.edu!cs.umn.edu!quest!digibd!merlyn
From: merlyn@digibd.com (Brian Westley (Merlyn LeRoy))
Newsgroups: comp.sys.mac.comm
Subject: Re: Very High Speed Modems and Macs
Message-ID: <1990Nov16.171247.1684@digibd.com>
Date: 16 Nov 90 17:12:47 GMT
References: <85816@lll-winken.LLNL.GOV> <1990Nov12.153526.1239@midway.uchicago.edu> <1990Nov12.182409.26829@rice.edu>
Organization: DigiBoard Incorporated, St. Louis Park, MN
Lines: 24

jack@Taffy.rice.edu (Jack W. Howarth) writes:
>Bob,
>   Wouldn't going to a hardware handshaking cable and using hardware handshak-
>ing in your terminal program help with your AppleTalk problem?

This isn't Bob, but I'm the guy at DigiBoard writing the driver for the
NuBus serial card that Bob is betatesting...

The problem with the mac serial ports is lack of control lines; mac ports
only have one input (CTS) and one output (DTR).  With high-speed modems,
you generally need one input for Data Carrier Detect and one for hardware
flow control.  With only one input line, you must forego DCD or flow ctrl...

Our serial card has DTR & RTS outputs, and DSR, DCD, CTS, and RI inputs.  I am
also adding configurations where you can force hardware flow control on,
using RTS/CTS, and let the mac see DCD come in as CTS (for example).

I hope to hit 57600 baud on all eight ports going full-bore.  Our A/UX
driver can keep up at 38400, but I've improved the core tx/rx routines
since then.

---
Merlyn LeRoy
..uunet!digibd!merlyn