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From: lotto@talcott.UUCP (Jerry Lotto)
Newsgroups: net.micro.pc
Subject: Re: WORD -- GROSS BUGS (?)
Message-ID: <591@talcott.UUCP>
Date: Thu, 1-May-86 10:47:25 EDT
Article-I.D.: talcott.591
Posted: Thu May  1 10:47:25 1986
Date-Received: Sun, 4-May-86 04:44:19 EDT
References: <1371@unc.unc.UUCP> <1215@utcs.uucp> <753@kontron.UUCP>
Distribution: net
Organization: Harvard Univ. Chem. Dept.
Lines: 33
Summary: Laserwriter flow control and PC-DOS vs XON/XOFF

In article <753@kontron.UUCP>, cramer@kontron.UUCP writes:
> > 
> > is due to handshaking problems. The Laserwriter can't keep up at 9600 baud
> > so it sends Xoff and you need software running on the PC that will pause
> > when it gets Xoff. Note that the Laserwriter comes factory configured for
> > parity ignored and high bit 0 on transmit so possibly the xoff isn't being
> > ...
> > tj

The laserwriter plus can be configured for DTR flow control and the
serial port is not hardwired at 9600 baud, the characteristics are
settable via postscript.  Of course, as is the habit of Apple computer,
this information is available only through the large "Inside
Laserwriter" manual. I guess that they figure most users will not want
to hook the Laserwriter up to anything serially.

> Amen to the XON/XOFF problem.  PC-DOS provides NO built-in XON/XOFF support.
> I would very much like to have an installable device driver for PC-DOS that
> allowed a C program to open COM1 or COM2 just like any other device, but
> ...
> Clayton E. Cramer

Such a beastie has been written at MIT (called COMPKG#) which is really
just the set of subroutines one would need to do a job like this. I do
not know if a device driver has been constructed from them. It has been
available from isib for anonymous FTP and is (arpa|public) domain.
-- 

Gerald Lotto - Harvard Chemistry Dept.

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