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From: jpp@slxsys.specialix.co.uk (John Pettitt)
Newsgroups: comp.sys.ibm.pc,comp.protocols.tcp-ip.ibmpc
Subject: Re: Mapping ETHERNET to COM(n)
Message-ID: <224@slxsys.specialix.co.uk>
Date: 18 Aug 88 07:27:30 GMT
References: <142@pbseps.UUCP>
Organization: Specialix International, London, UK.
Lines: 43

From article <142@pbseps.UUCP>, by rdp@pbseps.UUCP (Richard Perlman):
> I am looking for a program/patch/utility that would allow me to
> use IBM-PC software (i.e. Crossstalk, MS-Windows, Symphony etc.)
> with a psuedo port on an ethernet instead of the expected 
> standard serial port COM(1,2).  I want to "talk" with a tcp/ip
> host (running NFS if that matters).
> 
> The sysem is a standard IBM-PC/XT with a Western Digital WD8003E
> ethernet board.

The short answer is that it can't be done !

Most  dos comms programs use some inbuilt driver
that bit twiddles the uart (com1 or com2) directly,  
your ethernet virtual port would have to be a full hardware
level emulation of a 16450 uart.  

This is a common problem, we make intelligent serial 
cards for PC/AT type boxes and have a similar problems:
We don't look like a uart so the software wont talk
to us.

There are two solutions that I know of:

1) ASCOM - sorry don't know the authors - will let you
write your own uart interface.

2) 386 virtual 8086 mode, i.e. fake a uart in software
(n.b. this is not simple :-)

> 
> -- 
> Richard Perlman * pbseps!rdp@PacBell.COM || {ames,sun,att}!pacbell!pbseps!rdp
> 180 New Montgomery St. rm 602,  San Francisco, CA  94105  |*|  (415) 545-0233

John Pettitt
Specialix International

-- 
John Pettitt, Specialix, Giggs Hill Rd, Thames Ditton, Surrey, U.K., KT7 0TR
{backbone}!mcvax!ukc!pyrltd!slxsys!jpp            jpp@slxsys.specialix.co.uk
Tel: +44-1-398-9422       Fax: +44-1-398-7122         Telex: 918110 SPECIX G
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