13 Feb
2013
13 Feb
'13
9:09 p.m.
> Although some, such as NEC, did strange things!
> They run their HD ("1.4M") 3.5" drives at 360RPM (instead of
300RPM),
> so that they can get the same ~1.2M format structure on 8", 5.25",
> and 3.5"!
On Wed, 13 Feb 2013, Chuck Guzis wrote:
That makes perfect sense--it's the rest of the
world that's strange.
WHY did Shugart change the motor speed from 360 RPM to 300RPM?
There are high-density 5.25" drives made by
Matsushita and a few others
that do not offer a low-density (250K) mode for use on the PC98 platform.
The first "1.2M" drive that I got was Mitsubishi, and had a 50 pin
connector! I suspected that it was targeted at 8"
Only the very earliest of the 475 drives did not support "360K"
But, I am not familiar with the various sub-models, and what features
those added or lost.
Some PC98 drive interfaces require
"disk-changed", "ready", and "in-use"
signals as well as drive select 0-3. It makes sense--the "in use"
allows software to determine if a drive is present, regardless of
whether or not it has a diskette inserted. "Ready" likewise makes
sense. It can be challenging finding replacement drives.
Surely we don't really need 17 grounds, . . .
Try reading a
Victor 9000 (aka Sirius) with ANY other machine!
I can do it with my
Catweasel-equipped machine.,,