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From: dondorp@dnlunx.pttrnl.nl (Dondorp E.)
Newsgroups: comp.os.msdos.programmer
Subject: serial port BIOS
Keywords: serial port,BIOS
Message-ID: <7154@dnlunx.pttrnl.nl>
Date: 19 Feb 91 12:11:32 GMT
Organization: PTT Research Neher Laboratorium
Lines: 20

Help!!!

I want to write a simple application that can read/write from
COM1: (mouse) or COM4: (modem).
However MS-DOS will open the file named "COMx:" but cannot read or
write it.
Also when using direct BIOS calls, I still cannot use the serial
ports.
BtW the ports are functioning OK since both my mouse and my modem
are in use.

Now is there any reason why the serial ports cannot be accessed via
BIOS (INT24)?
(BtW I had all TSRs removed/not installed)

If it's just the fault of my BIOS, is there any way that I can use
the serial ports from my program in a reasonable machine independant
way?

	Erwin