Re: floppy.ko

[Gene Heskett]

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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