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From: prc@erbe.se (Robert Claeson)
Newsgroups: comp.dcom.lans
Subject: Re: PCNFS and SLIP
Keywords: SLIP,PCNFS
Message-ID: <1769@hugo.erbe.se>
Date: 10 Sep 90 19:45:41 GMT
References: <1990Sep04.113032.18935@pemstgt.gtc.de> <1764@hugo.erbe.se> <6609@gaboon.UUCP>
Distribution: comp
Organization: ERBE DATA AB, Jarfalla, Sweden
Lines: 89

On using PC-NFS over SLIP, I wrote:

> It is possible to increase the serial port speed on the PC to 38.4 Kbps
> with a small program (~10 lines of C code).

And Stan Voket (asv@gaboon.UUCP) asked:

> I, for one, would be interested in a posting of those 10 lines please.
> E-mail is fine, also.

Actually, there's a bit more than 10 lines with some cosmetic added.
Here it is, raw C code for Microsoft C under messy-dos. No shar
file, and no documentation. But as always, you get what you pay for :-)

---------- cut here ----------
/*****************************************************************************
*
*       com38k.c
*
*       Set the specified COM port to 38.4 Kbps.
*
*	Written specifically for Microsoft C 4.0.
*
*       Copyright 1989 Robert Claeson
*
*       This software can be freely distributed and used, as long as
*       you don't sell it, claims its yours or otherwise attempts to
*       give credit and/or profit to anybody else than the original
*       author, Robert Claeson.
*
*****************************************************************************/


#include <stdio.h>
#include <conio.h>


/*
 *      CPU port numbers to use for COM ports.
 */
 
#define COM1_PORT       0x03fb
#define COM2_PORT       0x02fb


/*
 *      Main function.
 */
 
main(argc, argv)
int argc;
char **argv;
{
        register int portadr;
        
        if (argc == 1)
                portadr = COM1_PORT;
        else
                switch (*argv[1])
                {
                case '1':
                        portadr = COM1_PORT;
                        break;
                case '2':
                        portadr = COM2_PORT;
                        break;
                default:
                        fprintf(stderr, "Only COM ports 1 and 2 can be specified.");
                        exit(2);
                }

        /*
	 * This does... ehr, it's too hard to explain.
         */
         
        outp(portadr, inp(portadr) | 0x80);
        outp((portadr -= 3), 3);
        outp(++portadr, 0);
        portadr += 2;
        outp(portadr, inp(portadr) & 0x7f);

        exit(0);
}
---------- cut here ----------
-- 
Robert Claeson                  |Reasonable mailers: rclaeson@erbe.se
ERBE DATA AB                    |      Dumb mailers: rclaeson%erbe.se@sunet.se
                                |  Perverse mailers: rclaeson%erbe.se@encore.com
These opinions reflect my personal views and not those of my employer (ask him).