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From: sdyer@bbnccv.UUCP (Steve Dyer)
Newsgroups: net.micro.pc
Subject: Re: Enhanced graphics adapter woes
Message-ID: <608@bbnccv.UUCP>
Date: Tue, 4-Jun-85 17:38:03 EDT
Article-I.D.: bbnccv.608
Posted: Tue Jun  4 17:38:03 1985
Date-Received: Thu, 6-Jun-85 03:17:59 EDT
References: <1446@bbncca.ARPA>
Organization: Bolt Beranek and Newman, Cambridge, MA
Lines: 28

> When run with
> a vanilla IRGB monitor, neither program works--Turbo clears the screen
> and does not produce any more output, and Sidekick's menu box is pushed
> far to the right, half-way off the screen, looking as if the vertical
> hold was maladjusted.
> 

I wish to correct one piece of mis-information in this, my previous posting.
Turbo Pascal works fine in non-enhanced color mode.  Doubtless it was some
renegade program which caused Turbo to seize up once; in the midst of the
other incompatibilities, it appeared that this was another EGA problem.

Sidekick still doesn't work as-is, nor, interestingly, does IBM's own
"Professional Debug Facility."  Patches for both of these problems can be
found on the IBM PRO SIG on Compuserve.  I applied the one to IBM's debugger
and it now works like a charm.  The patches listed for Sidekick 1.11C don't
agree with my version of Sidekick which is 1.10B.  But I applied the "brute
force" method, and replaced a handful of "OUT DX,AX" (EEH) instructions with
"NOP" (90H) instructions, and it now appears to work.

The consensus on the EGA is that IBM has attempted to be BIOS-compatible, but
accessing CGA registers or the actual display memory map is not always kosher.
I have taken care of most of my incompatibility problems now.  (But why should
I feel like I've purchased a PC-(in)compatible when I've gone with IBM?)
-- 
/Steve Dyer
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