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From: BRACKENRIDGE%USC-ISIB@sri-unix.UUCP
Newsgroups: net.micro.pc
Subject: Re: CTTY Problems
Message-ID: <12194@sri-arpa.UUCP>
Date: Thu, 6-Oct-83 01:15:00 EDT
Article-I.D.: sri-arpa.12194
Posted: Thu Oct  6 01:15:00 1983
Date-Received: Thu, 6-Oct-83 20:49:27 EDT
Lines: 15

From:  Billy <BRACKENRIDGE@USC-ISIB>

Programs can use DOS calls or IBMPC BIOS calls or directly write
to the screen using the MOV instruction. DOS calls are the slowest.

In order to make a competitive product most software developers use
the BIOS calls or write directly to the screen. VDTE as a case in point
could not keep up with 9600 baud terminal lines if it were using the DOS
calls.

Only the DOS calls can be diverted to the ANSI standard terminal supported
by DOS 2.0. This is part of the reason for the slowness of the calls.


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