28 Apr
2007
28 Apr
'07
9:36 p.m.
On Sat, 28 Apr 2007, Jules Richardson wrote:
Does anyone know if these are 40 or 80 cylinder?
Google seems to suggest that
they're 40 (which is what I need).
TM100-2 [with or without A] is 40 cylinder 2
sided; what is commonly being
referred to as "360K". And, in fact, IBM used them.
The drives all have little stickers on
saying "Quad density" though (which always implies to me 80-track, but maybe
to Tandon it means 40 track but you have the luxury of two sides :)
80 cylinder 2 side is TM100-4.
TM100-4M is 100 tpi, insteap of 96tpi.
I don't recall Tandon EVER EVER using the phrase "Quad density".
To most people, "Quad density" means 80 cylinder 2 sides.
BUT, . . .
Intertec (Superbrain) used "double density" to refer to their MFM 1 sided
40 track. When they went to DSDD (40 cylinder 2 side MFM), they called
that "Quad density"! Could those stickers have come from them, or
somebody similar?
And later, when the3y went to 96tpi DSDD (80 cylinder 2 side MFM),
they called that "SUPER density" ("SD"!!!!).
What is the next size of olives?
One MAJOR caveat. When drives were "repaired" by third party board
swappers, they sometimes ended up with the wrong designators.
SO, it COULD BE TM100-4.
I have some 100-4M (Micropolis compatible 100tpi, instead of 96tpi) that
are labelled 100-4, instead of 100-4M.
--
Grumpy Ol' Fred cisin at xenosoft.com