Date   : Tue, 27 Aug 1985 22:48:52 pdt
From   : swillett%ucbamber.CC@ucb-vax.ARPA
Subject: Re: KayproII upgrade

I have a 1982 vintage Kaypro II with the Pro8 upgrade and four half height
drives - two DSDD, two DSQD (all Teac) which has also been upgraded to 5 MHz.
I have had virtually no problems with this combo.  I installed a switch which
allows me to set either the Double Density or the Quad Density pair as "A"
and "B" drives.  It is therefore possible for my machine to act like a KP 4
with the flip of a switch.  I do not recommend leaving yourself with no 48 tpi
drive, since the 96 tpis are not completely compatible with the 48s, and if
you want to be able to exchange disks with other machines you need a 48.  My
understanding of the problem is that a 96 drive cannot completely erase or
write over a 48 track.  The 96 doesn't care, since it has a narrow head and
only sees the track it writes (although it can read a wider track by reading
just the middle of it).  However if you take a disk which was written on
with a 48 drive, then write over part of it (say the directory!) with a 96,
and then try to read it again with a 48, the 48 sees some of the old track
along with the new track and gets garbage.

Any way, that's what I did, and it gives me about 2 1/4 meg of floppy stor-
age on board my Kaypro.  Then I added a 1 meg RAM disk.......