Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!seismo!hao!hplabs!sri-unix!MMOON.ES@PARC-MAXC.ARPA
From: MMOON.ES@PARC-MAXC.ARPA@sri-unix.UUCP
Newsgroups: net.micro.cpm
Subject: Re: 5 inch disk ?
Message-ID: <12088@sri-arpa.UUCP>
Date: Tue, 27-Sep-83 13:33:00 EDT
Article-I.D.: sri-arpa.12088
Posted: Tue Sep 27 13:33:00 1983
Date-Received: Sun, 2-Oct-83 01:21:57 EDT
Lines: 14

5" & 8" disks are generally incompatible on the same controller *unless*
you have some convienient (read that software controllable) means of
changing the 179X disk controller chip's clock frequency.  The last time
I looked, 5" drives were transfering data at 1/2 the rate of 8" drives,
no matter whether one is using single or double density,  but I was
looking at 48 tpi, 40 track per side drives; get the some info on the 96
tpi, 80 track per side drives to be certain.  There are several Morrow
double densitity controllers; I have one of the discontinued I/O mapped
boards which is incapable of DMA, & this device *definitely* will not
support connectors to 5" drives or clock rate changes, at least not
without extensive hatchet work.  Good luck if you decide to continue.  I
would appreciate being kept posted in that event.

		Moon