Message-ID:	<01FD6EC775C6D4119CDF0090273F74A4FD68B1@emwatent02.meters.com.au>
From:	"da Silva, Joe" <Joe DOT daSilva AT emailmetering DOT com>
To:	"'opendos AT delorie DOT com'" <opendos AT delorie DOT com>
Subject:	RE: Combining DR-DOS 7.03 with OEM DR-DOS 7.05 to gain LBA capabi
	lities (Was: Re: HIMEM.SYS and DOS 8)
Date:	Tue, 24 Sep 2002 12:41:57 +1000
MIME-Version:	1.0
X-Mailer:	Internet Mail Service (5.5.2653.19)
Reply-To:	opendos AT delorie DOT com

Well, this sound potentially interesting, but I must ask,
does this overcome the "rename bug" of DR-DOS 7.04+?
If so, then it is definitely interesting (otherwise perhaps
not so interesting).

Joe.

> -----Original Message-----
> From:	Matthias Paul [SMTP:Matthias DOT Paul AT post DOT rwth-aachen DOT de]
> Sent:	Monday, September 23, 2002 7:55 PM
> To:	opendos AT delorie DOT com
> Subject:	Combining DR-DOS 7.03 with OEM DR-DOS 7.05 to gain LBA
> capabilities (Was: Re: HIMEM.SYS and DOS 8)
> 
> On 2002-09-23, John T Ross:
> 
> > You previously explained to me use of the extended
> > partition type C5h, instead of the old 05h type, to allow
> > DR-DOS 7.03 coexist with a LBA enabled OS using disk
> > space above 8 Gb.
> 
> Yes, this still stands and is the recommended method.
> I am using it myself for years and have not had a single
> problem with it.
> 
> > Will you elaborate on the combination of the DR-DOS 7.05
> > IBMBIO.COM and DR-DOS 7.03 IBMBIO.COM files? I
> > understand one's need to ensure the hard drive doesn't
> > contain any FAT32 partitions. I agree that a binary patch
> > to keep the 7.05 BIOS from logging into FAT32 partitions
> > is a useful saftey net.
> 
> OK.
> 
> > If I use a PC with a flash BIOS that supports LBA hard
> > drives, what does this 4th solution offer that the former
> > doesn't?
> 
> Since the DR-DOS 7.05 IBMBIO.COM supports LBA, you can
> access disks larger than 8 Gb. The problem is that the
> 7.05 DOS BIOS will also log in FAT32 partitions, and
> the 7.03 BDOS does not know how to handle them, so
> you will end up with invalid drives, which might be
> potentially dangerous and is inconvenient in any way.
> 
> Hence the patch to keep the DOS BIOS from recognizing
> FAT32 partitions. This is not needed, if you do *not*
> have any FAT32 partitions.
> 
> Please note, that such a patch does *not* exist at this
> time, but it seems relatively easy to derive one after
> a few sharp looks at IBMBIO.COM. Sorry, I don't have any
> time left for it at the moment, but if there is a strong
> interested I will put it on my (already long, sigh!) list
> to look at.
> 
	------ snip ------

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