What's the real difference between QIC-40 and QIC-80?

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#18885

From: Richard Krehbiel
Date: Tue, 05 Jan 1993 13:45

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What feature is it that makes the DC2120 tape store 120M on a Jumbo
250 and only 60M on a Jumbo 120?  Does QIC-80 have twice as many
tracks?  Is the linear density doubled?  Both run from the same floppy
controller, so I doubt encoding differences.

(I just helped my Dad install a Jumbo 120 drive.  On the drive's
circuit board were two boxes labelled "120" and "250", and an "X" was
in the "120" box; clearly they share the logic board, perhaps with
some component differences.  So I start speculating: what's the real
difference here that makes the 250 cost more?  Perhaps the 250 has a
different cam on the head positioner stepper and a different ROM that
makes twice as many tracks available...)
-- 
Richard Krehbiel                                 richk@grebyn.com
OS/2 2.0 will do for me until AmigaDOS for the 386 comes along...

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Path: arc1-ca.pugleaf.net!sparky!uunet!grebyn!daily!richk
From: richk@grebyn.com (Richard Krehbiel)
Subject: What's the real difference between QIC-40 and QIC-80?
Message-ID: <1993Jan5.134512.710@grebyn.com>
Lines: 12
Sender: richk@grebyn.com (Richard Krehbiel)
Organization: Grebyn Timesharing
Date: Tue, 5 Jan 1993 13:45:12 GMT