On Tuesday 17 April 2007, H. Peter Anvin wrote:
>Gene Heskett wrote:
>> I have the usual fd0, a 3.5" 1.44 drive, and fd1, a 5.25" 720k drive in
>> this machine, both are enabled in the bios with the correct types being
>> set there.
>
>A 5.25" 720k drive?! That's not a PC standard drive -- 5.25" came in
>180K, 360K and 1200K varieties, whereas 3.5" came in 720K, 1440K and
>2880K varieties (not including superfloppies.)
>
> -hpa
It sure is a std drive, Peter, although many of the later ones that were set
up as 1.2 megger's by the pc crowd who have access to a 500 kilobaud
controller, could have the 360 rpm spindle jumper'd back to 300 rpm, and when
fed with a 250 kilobaud controller (WD177x/277x/279x family, which includes
the Fujitsu MB8877), they are perfect 720k devices and are spec'ed that way
by the makers. Many of the older full height Tandon 100-4's could also step
quite a few tracks closer to the spindle & I ran them as 765k drives by using
84 tracks. I even have a chinon that will make 86 tracks most of the time.
These were all quite common in the middle '80's. Before your time I suspect.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
I have the simplest tastes. I am always satisfied with the best.
-- Oscar Wilde
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