Date   : Thu, 27 Sep 1990 01:22:30 GMT
From   : swrinde!cs.utexas.edu!hellgate.utah.edu!cc.utah.edu!cc.usu.edu!slsw2@ucsd.edu (Roger Ivie)
Subject: MAXRom and TEAC FD55 drive 1.2M??

In article <1990Sep24.235858.13077@techbook.com>, fzsitvay@techbook.com
(Frank Zsitvay) writes:
> 
>    Well, in theory you could use a 1.2 meg drive as a 750k drive, but
it would
> be a waste of money to do so.

Not if you happen to have a bunch of 1.2 meg drives hanging about... :-)

>    problems with going the 1.2 meg drive route....   the tracks these drives
> write are substantially narrower than even the dsqd drive tracks, to say 
> nothing of the dsdd tracks.   also, the write current is also greater.

Not true. 80 tracks is 80 tracks, right? They get the extra capacity by
running at 500 KHz data rate instead of 250 KHz used by dsqd.

The only real problem with using a 1.2 MB drive is that they tend to use
pin 34 as Diskette Changed rather than Drive Ready. This confuses most
CP/M machines. This might be jumperable depending on the drive. The 
alternative is to just ground it so the drive always looks ready.
-- 
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Roger Ivie

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