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'OT: XT IDE'
1998\09\10@105904 by miked

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> Hi,
>
> I'm afraid there is no IDE controller for 8088 boards. The XT did not
> support the hard drive, so that the HDD controller cards (connecting to
> MFM drives) itself have contained the required BIOS extensions. BTW I have
> not seen any 8-bit IDE controller.
>
> Imre
Seagate made one,  the ST05X. We may have in in an old XT BBS box.

1998\09\10@122940 by Martin McCormick

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       Thanks to all who replied.  I just bought some from Jameco and
they are supposed to have the correct BIOS extension and 8-bit
connector to bring IDE capability to a XT-type computer.  We'll see
what happens.  As background, everybody is right in that the P.C/Xt
BIOS does not support a lot of things in its original form on the
mother board.  What happens is that disk drive controllers and other
peripherals have a little chunk of ROM that adds to the existing BIOS
and gives capabilities to it that weren't there before.  In a perfect
world, each different peripheral has its own block of address space
such that no two conflict.  Some cards allow jumpers to be changed to
relocate ROMS if they do happen to clobber something else, but the
older peripherals are apt to be difficult if not impossible to move if
there is a problem.  If these cards work, the performance should be
about the same as any hard drive in an XT.  I have no idea what the
geometry translation of the IDE controller will do to size limits, but
I guess I will find out soon.

Martin McCormick

Mike DeMetz writes:
>> Hi,
>>
>> I'm afraid there is no IDE controller for 8088 boards. The XT did not
>> support the hard drive, so that the HDD controller cards (connecting to
>> MFM drives) itself have contained the required BIOS extensions. BTW I have
>> not seen any 8-bit IDE controller.
>>
>> Imre
>Seagate made one,  the ST05X. We may have in in an old XT BBS box.

1998\09\10@173824 by paulb

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Martin McCormick wrote:

> If these cards work, the performance should be about the same as any
> hard drive in an XT.

 ... the *best* of any drive an an XT, I'd say!

>  I have no idea what the geometry translation of the IDE controller
> will do to size limits, but I guess I will find out soon.

 Well, depends on whether it provides LBA mode and such.  This is a
BIOS function and after all, the BIOS is on the card.

 The *big* conundrum about these cards is - where or how do they store
or deal with the drive type info.  An XT has no specified CMOS memory.

 Now there's a problem!  (One answer: use only the IDE default info).
--
 Cheers,
       Paul B.

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