8" drive on PC troubleshooting

[Dwight K. Elvey]

>From: "Fred Cisin" <cisin at xenosoft.com>
 >
>On Tue, 1 Mar 2005, Dwight K. Elvey wrote:
>> >> Wrong step rate! Poke a new on eint othe chip, or does it use the old
>> >> table of junk INT 13h used to supoprt?
>>
>> Hi
>>  There is a table that one stores the step rate
>> for the drive. You need to alter the value for
>> slower drives, like your 8 inch. I forget where
>> is it but it is in that lower area someplace
>> ( 40:xxx or something ). It isn't a problem
>> of the controller. It should work with any controller,
>> you just need to find the table and change it.
>> It has been a while since I've fiddle with it
>> to make my drives step with less noise ( and wear ).
>> Dwight
>
>While the default table is often in low memory,
>sometimes it is even in ROM.
>It is pointed to by INT1Eh.
>To alter values in the table, copy it, alter the copy,
>then repoint INT1Eh to point to the new address.
>Be sure to restore INT1Eh when you are done,
>or INT13h may encounter serious difficulties.
>
>If you've got a copy of the PC Technical Reference Manual,
>most of the disk parameter table is documented right after INT13h.

 Ah yes, the big purple book. I couldn't remember where
I saw that info.
Dwight