jcb@loral.UUCP (Jay Bowden) (03/16/90)
Help! I have an old (1986?) Hard disk card. Sort of a strange one, it
is an Micro Design International "WARP DRIVE" 21 MB SCSI-interfaced
hard disk on a card. I originally used it in an XT I am sure, but then
I moved it to an AT, and was quite pleased when I got an AT, and was
able to plug it right in and it booted. I realize that I do not have
the advantage of 16 bit transfers, and the hardcard always was
relatively slow, so I have now put an AT-class drive and controller in
the AT.
I want to plug the hardcard into an XT, and give it away to a friend.
But it don't boot! Infact, it hangs up in the cold boot process, and
after the RAM test, it never comes back, not even with a disk error!
Plug it back into the AT, and it boots fine!
Plug it into a different XT (but w/the same motherboard mfgr),
and it hangs up.
Plug it back into the AT, and it boots fine!
Plug it into the XT, with a different BIOS chip, and it hangs
up.
I've tried each of the DMA channels, including the "pseudo DMA" option
(program controlled port IO, I suppose) the card supports, but it still
locks up. I've tried moving the disk ROM from D800:0 (its default) to
C800:0. Either way, it boots fine in the AT, but hangs up in the XT.
What am I missing? Anyone have a clue? Solve this and you
will have my eternal gratitude, as well as that of the person
I want to give the PC to!
Thanks!
- Jay
--
------------------------------------------------------------------
Jay Bowden, EE/Consultant; see also Bowden Engineering
Currently contracted at Loral Instrumentation, San Diego
{ucbvax, ittvax!dcdwest, akgua, decvax, ihnp4}!ucsd!loral!jcbghost@cup.portal.com (Robert Bruce Ferrell) (03/18/90)
Try doing a low level on it in the AT but not a high level
before you put it into the XT. fdisk and the high level
format puts some goodies in the 1st physical sector that may
be interfering with the boot-up.
ghost@cup.portal.com or bferrell@mcimail.com
Yes! I AM unique... so farin540-13@cs.chalmers.se (Christer Olsson MEDNET) (03/19/90)
In article <2454@loral.UUCP> jcb@loral.UUCP (Jay Bowden) writes: >Help! I have an old (1986?) Hard disk card. Sort of a strange one, it >is an Micro Design International "WARP DRIVE" 21 MB SCSI-interfaced >hard disk on a card. I originally used it in an XT I am sure, but then >I moved it to an AT, and was quite pleased when I got an AT, and was >able to plug it right in and it booted. I realize that I do not have >the advantage of 16 bit transfers, and the hardcard always was >relatively slow, so I have now put an AT-class drive and controller in >the AT. > >I want to plug the hardcard into an XT, and give it away to a friend. >But it don't boot! Infact, it hangs up in the cold boot process, and >after the RAM test, it never comes back, not even with a disk error! > >Plug it back into the AT, and it boots fine! > >Plug it into a different XT (but w/the same motherboard mfgr), >and it hangs up. > >Plug it back into the AT, and it boots fine! > >Plug it into the XT, with a different BIOS chip, and it hangs >up. > > >I've tried each of the DMA channels, including the "pseudo DMA" option >(program controlled port IO, I suppose) the card supports, but it still >locks up. I've tried moving the disk ROM from D800:0 (its default) to >C800:0. Either way, it boots fine in the AT, but hangs up in the XT. > I think two problems can occur: 1: The PC has an very old BIOS which don't support hard drives. I.e old IBM PC. 2: The machine is an old 8Mhz PC with 8Mhz bus speed. The controller maybe don't work with fast 8-bit bus. (many AT's has 4.77Mhz PC-compatible 8-bit busspeeds and all 8-bit cards works well with them). Check if you can slowdown the PC to 4.77 Mhz and check the bios' age.