Due to massive amounts of caffeine & sleep deprivation, A.R. Duell said:
[snip]
>The disk turns at a constant speed. What changes is the speed of the data
>clock. The bits are sent faster for the outside tracks, so it can fit more
>sectors on said tracks.
>
>I never really saw the point of variable-speed drives. Changing the data
>clock is a lot easier, and probably faster (getting the spindle
>up-to-speed and locked at that speed takes considerable time).
>
>>
>> That's how it gets 21 sectors on tracks 1 to 17, 20 sectors on tracks 18
>> to 24, 18 sectors on tracks 24 to 30, and 17 sectors on tracks 31 to 35.
>>
>> AFAIK, all PET-era CBM drives do this, and the 1540 and 1541 drives do as
>> well.
>
>> Doug Spence
>> ds_spenc_at_alcor.concordia.ca
>-tony
>ard12_at_eng.cam.ac.uk
Righto, Tony! There are programs that you can get for IBM PC's that do this
and you can store 1.8Megs on a 1.44Meg drive!
(Didn't the Apple and Amiga do this with there 800K and 880K drives,
respectively?)
See Ya,
Roger "Merch" Merchberger
--
Roger Merchberger | If at first you don't succeed,
Programmer, NorthernWay | nuclear warhead disarmament should
zmerch_at_northernway.net | *not* be your first career choice.
Received on Thu Jun 19 1997 - 09:33:40 BST