From: Charles Sandmann <sandmann AT new-orleans DOT NeoSoft DOT com>
Subject: Re: fast text screen access
To: mfeldman AT seas DOT gwu DOT edu (Michael Feldman)
Date: Wed, 21 Dec 1994 23:20:34 -0600 (CST)
Cc: eliz AT is DOT elta DOT co DOT il, steve AT prd DOT co DOT uk, djgpp AT sun DOT soe DOT clarkson DOT edu

> > Btw, does anybody on the list know why in DPMI mode screen
> > accesses are so much slower?
> > 
> I'm curious too. Since version 2 will be exclusively DPMI, it'll
> be an issue for many of us.

The problem is with the GO32 implementation of interrupts under DPMI.
The first pass implementation I added was a really crappy job.

Under V2 and CWSDPMI interrupts will be as fast (or faster) than with
V1.1x.

Direct screen access will run at the same speed, since it is a memory
to memory transfer.  It is the other function that are called which
do int 0x10 calls that are much slower.