pwu@uwmacc.UUCP (01/17/87)
Has anyone tried to install a 20M fixed disk in an old XT
without installing a new controller card?
How do you tell the computer to format 20M instead of 10M,
are there switches somewhere on the controller that one can
set?
peter
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*/tj@utcs.UUCP (01/17/87)
I've got my asbestos underwaer on in case I am wrong and the flames are hot! Some of the old controller cards for the IBM hard drives had no jumpers or switches on them and would only work with 10 meg drives. If it has jumpers or switches then you can probably reconfigure it for 20 meg. There are usually three sets of jumpers if there are any. one is for the memory address of the ROM on the controller and this affects whether it is hard controller 1 or 2. There is another set that controls the port address of the port used to control the card. The third set is usually a set of 4 jumpers that control the type of drive attached to the controller. (this is all from a limited experience with a couple of the old slugs) If you can do a low level format using your diagnostics (not the format command...) then you can try the sixteen possible combinations of the four jumpers until you end up with the right one maybe! The easiest approach is to find doc on your card. Its not hard usually to go to a few shops and find someone with the manual for your controller card
brown@nicmad.UUCP (01/18/87)
In article <1987Jan17.112246.8040@utcs.uucp> tj@utcs.UUCP (tj) writes:
[Talks about newer version of card having jumpers]
If the newer version of the IBM hard disk card (which isn't in our copy
of the Options Tech Ref Manual) can support 20MB drives, don't bother
trying all 16 positions and running the low-level format, use my DISKREAD
program, which tells you the number of size of the drive that the hard
card thinks is attached. You can set the switches, reboot the system
and re-run my program to see if you have hit the right combination.
An easier way may be to call your local IBM dealer's service department
and ask them if they have the BIOS listings for this newer card and
from there you can find the information on what to set the jumpers to.
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