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From: drtiller@uokmax.ecn.uoknor.edu (Donald Richard Tillery Jr)
Newsgroups: comp.sys.amiga.emulations
Subject: Re: IBeM: The author responds
Message-ID: <1991May31.045029.2047@uokmax.ecn.uoknor.edu>
Date: 31 May 91 04:50:29 GMT
References: <1991May30.130410.1@elec.canterbury.ac.nz>
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK
Lines: 53

In a message From: tomlinson@elec.canterbury.ac.nz




>Video modes.
>I have no immediate plans to emulate EGA/VGA graphics.  Remember that the Amiga
>stores data as bitplanes and IBMs store 1/2/4/8 pixels (depending on colours)
>in the same byte.  The time taken to split these is considerable.  A mono
>mode does make sense, as this would speed up scrolling, especially on chip-
>only machines.

My copy of Microsoft C Programming for the PC by The Waite Group says that
EGA is a BITPLANE mode just like our graphic modes.  Well, not exactly, the
4 planes reside in the same memory.  A port is written to that tells the EGA
board which plane that you are addressing.  It also says that the
16 color VGA is that same as the EGA except that it has 480 vertical lines
rather than EGAs 350.  I sure would think that this would make it possible
to emulate EGA and 16 color VGA on the Amiga.

I need EGA (or better VGa) to run OrCAD for school.  CGA is functional, but
it is very slow and difficult to run in that limited resolution (and the
2 color CGA is distorted).  The fact that it runs is a tribute to your program
though, and I thank you (proven by money which you should have by the time
you read this).  Microsoft Mouse emulation (see below) would also help with
this program.  I'm only going to use the damn thing until I graduate, and
then I'm going to write my own version for the Amiga (no really, I'm starting
it in August when the diploma is in my hot little hand!).  Then I'll sell it
for 1/4 the price of the IBM version (the people who make it are not very
friendly, and refuse to port it for our machine...I'll see if I can get their
attention :-)

>Mouse Support.
>This will be coming soon - just like the mono display.  All I need is some
>time to write it!

Yeah!  Thank you, thank you, thank you!


I'm still wondering if I can create a sort of dynamic hard drive for the
emulator (kind of the way the AtOnce does).  My needs are limited in the IBM
area, and I don't want to have to repartition my HD once to make room, and
again to reclaim the room after I graduate.  Any chance of such a beast?

I have trouble with the newest version of SI (Norton utility you know)
version 5.something.  It barfs with a divide overflow after putting up the
title screen.

Neat, now the old SI says I'm running a NEC V20...what does that stuff up
there about the "68000?" mean?


Rick Tillery (drtiller@uokmax.ecn.uoknor.edu)