Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!wuarchive!mit-eddie!uw-beaver!zephyr.ens.tek.com!tektronix!percy!parsely!bucket!leonard
From: leonard@bucket.UUCP (Leonard Erickson)
Newsgroups: comp.sys.ibm.pc
Subject: Re: USING TWO GRAPHICS CARDS IN A COMPAQ 386/25
Keywords: VGA CGA COMPAQ 386 GRAPHICS
Message-ID: <1928@bucket.UUCP>
Date: 20 Jan 90 07:37:19 GMT
References: <5209@arctic.nprdc.arpa> <3369@rti.UUCP> <25a4cdee:3725.5comp.sys.ibm.pc;1@vpnet.UUCP>
Organization: Rick's Home-Grown UNIX; Portland, OR.
Lines: 39

akcs.amparsonjr@vpnet.UUCP (Anthony M. Parson, Jr.) writes:

>Speaking of running mono with color, I also have a question:
>In running mono + ega/vga, will  hercules-type board work?  I had assumed
>(haven't tried this yet, but I want to use 2 monitors with Codeview)
>that only a MDA (Ibm mono without ability to display graphics) was the
>required mono card.  Can the graphics part of Hercules-graphics cards be
>turned off???

I am happily running a Hercules card with a VGA card. There are 3 possible
configurations for real Hercules cards an most clones.
1. DIAG (looks like an MDA to the system)
2. HALF (only use memory from B000-B7FF)
3. FULL (use all memory on card, B000-BFFF)

Hercules cards come with a utility (HGC.COM) for setting these modes. Most
clone cards do too. Half mode is compatible with EGA/VGA as when they detect
a mono board, they don't use the B000-B7FF area anyway. So this means you
can use the first of the two graphics screens available on the Hercules card.

If you have a VGA that will let you disable it through software, you can
use both screens. My VGA board does (probably because it was made by
Hercules :-).

So I have a pair of batch files:
MONO.BAT
mode mono
vgaset off
hgc full

CO80.BAT
hgc half
vgaset on
mode co80
-- 
Leonard Erickson		...!tektronix!reed!percival!bucket!leonard
CIS: [70465,203]
"I'm all in favor of keeping dangerous weapons out of the hands of fools.
Let's start with typewriters." -- Solomon Short