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From: "Rod Pemberton" <dont_use_email@xnothavet.cqm>
Newsgroups: alt.os.development,comp.os.msdos.programmer,alt.lang.asm
Subject: Re: detecting emulation or console windows
Date: Mon, 02 Jun 2014 00:46:41 -0400
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On Sun, 01 Jun 2014 17:48:09 -0400, James Harris  
<james.harris.1@gmail.com> wrote:
> "Rod Pemberton" <dont_use_email@xnothavet.cqm> wrote in message
> news:op.xgq5q0ms6zenlw@localhost...

>> It seems dosemu doesn't provide the PS/2 A20 bit, and doesn't toggle
>> keyboard A20 bit when A20 is enabled.  No real machine fails that.
>
> Are you sure? Take a look at the A20 Controls section in
>
>   http://aodfaq.wikispaces.com/machine+characteristics
>

Well, I should've consulted that.  I didn't forget it exists.  Clearly,
I didn't recall any with that defect.  I remember some had the keyboard
bit permanently set.  But, for an emulator, I'd still argue they should
implement the "correct" method. ;-)  How common are some of the problem
machines we found anyway?  IIRC, probably don't, it was my, yours, and
Wolfgang's obscure collection ... Or, Steve? Alexei?  I.e., this was not
what we could call an "excellent" sample selection of machines.


Rod Pemberton