From: horst DOT kraemer AT t-online DOT de (Horst Kraemer)
Newsgroups: alt.msdos.programmer,comp.os.msdos.misc,comp.os.msdos.djgpp,alt.msdos
Subject: Re: 32bit CDROM driver for DOS??
Date: Sun, 24 Oct 1999 20:25:13 GMT
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To: djgpp AT delorie DOT com
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On Sun, 24 Oct 1999 17:17:37 GMT,
DELCAPSyerricde AT pineight DOT 8mSOFTWARE DOT com (Damian Yerrick) wrote:

> On 24 Oct 1999 14:26:42 GMT, aw AT mail1 DOT bet1 DOT puv DOT fi wrote:
> 
> > Rez <rividh DOT minusthispart AT earthlink DOT net> wrote:
> > > Does anyone know of a 32bit CDROM driver for DOS?
> > > 
> > > Yeah, it wouldn't work in plain M$DOS, 
> > 
> > Why not?  You can use 32-bit instructions in real mode -
> > it's just not the default operand size.
> 
> Yes, but real-mode interrupt handlers will often scramble the high
> word of the 32-bit registers.

It's true that there was this problem with some commercial software 10
years ago.

Please be more specific. Which RM interrupt handler will actually
clobber the high words of the E-registers ? It's important for
everybody to know this in order to avoid this product.

built-in BIOS handler (which BIOS ? )
bilt-in DOS handler   (which version ? )
handler provided by commercial software (which software ?)
handler provided by freeware/shareware or yourself (then throw them
and get bugfree products ;-)


Regards
Horst