ide harddrive

From: Fred Cisin <>
Date: Thu Mar 29 11:47:29 2001

See remarks in the folloowing:

On Wed, 28 Mar 2001, Richard Erlacher wrote:

> I had no idea that int13 talks directly to the EPP port!
It talks to whatever YOU WRITE it to talk to. The one that came with your
motherboard is written for PC disk controllers. It is fairly simple code,
and the source code is in the Technical Reference manual.

> My understanding was that int13 uses a disk driver based on the
> assumption that the ROM code talks to the device interface.

"uses a disk driver"?? It _IS_ the lowest level disk driver you've got.
Int13 typically IS the ROM code that talks to the disk controller
hardware. By intercepting the vector, it can be supplemented or replaced
by code in RAM.

> I've no indication in any of the doc's or marketing
> literature, for example, that I could boot my system from a SCSI drive attached
> to the printer port via my Adaptec Printer-Port<=>SCSI adapter. I'd have
> thought they'd make the claim if anyone would.

This thread was NOT about BOOTING.
If you want to BOOT using one of your Trantor/Adaptec T338/348/358
parallel port SCSI adapters, then you need to install a ROM in your
computer that replaces and/or enhances INT13. Such a ROM is not
commercially available as far as I know.

To use ANY of the parallel port drives, whether SCSI or IDE, you need to
either replace your ROMs with code that talks appropriately to that port
rather than talking to the disk controller ports, OR
boot the computer using a more "conventional" drive, and then run
appropriate software that either runs as a block mode device driver, OR
uses the network redirector (as CD-ROMs do with MSCDEX.EXE), OR
hooks/replaces INT13.

In short:
Parallel port devices are not usually used to boot from.

Grumpy Ol' Fred
> Dick
> ----- Original Message -----
> From: "Fred Cisin (XenoSoft)" <>
> To: <>
> Sent: Wednesday, March 28, 2001 7:47 PM
> Subject: Re: ide harddrive
> > > I've seen, and, in fact, own, several parallel port to SCSI interfaces, but
> > > never a parallel port to IDE type.
> >
> > I have five of them here. (probably some more buried deeper)  These are
> > Rodeo.  One that takes 3.5" IDE, and four that take 2.5" IDE and have
> > batteries. I've also used ones from Pacific Rim.
> >
> >
> > >  It's quite conceivable, though.
> >
> > Thank you.
> > I have a policy of raising the price every time somebody expresses doubt
> > of existence of stuff that I'm selling.  After all, that proves that it
> > must be RARE!
> >
> >
> > > The software would be a pain, however.
> >
> > Not too bad.  There are easy ways and hard ways to do it.  It's largely an
> > issue of at what level it operates.  (replacement Int13, v block mode
> > device driver, etc.)
> >
> > --
> > Grumpy Ol' Fred
> >
Received on Thu Mar 29 2001 - 11:47:29 BST

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