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From: km@mathcs.emory.edu (Ken Mandelberg)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: 2 floppy drives on one controller
Message-ID: <1991Mar3.134600@mathcs.emory.edu>
Date: 3 Mar 91 18:46:00 GMT
Sender: news@mathcs.emory.edu
Reply-To: km@mathcs.emory.edu (Ken Mandelberg)
Organization: Emory University, Dept of Math and CS
Lines: 26

I am trying to run a 1.44MB 3.5" Sony and a 1.2MB 5.25" Okidata on one
controller. The Sony is the built in, and I added the Okidata with the
usual twisted cable used to add a second drive. The cable goes to the
Sony first and then to the Okidata.

It all almost works, except for one thing. When both are connected the
Okidata works, but the Sony doesn't. If I powerdown the Okidata or
disconnect the data cable from it, the Sony works. 

The drives definitley don't have conflicting addreses because of the twist.
The Sony is A: the Okidata is B:. (Both are drive 1, but the twist changes
the Okidata).

I have no spec sheets on the jumpers for either drives. The Sony seems to
have nothing but drive address, with no obvious provision for on drive
termination. The Okidata does have dip switch marked terminator, but 
either way it interferes with the Sony. I've fiddled with all the other
dips and jumpers on the Okidata and none help the Sony up the line.

Any ideas?

-- 
Ken Mandelberg      | km@mathcs.emory.edu          PREFERRED
Emory University    | {rutgers,gatech}!emory!km    UUCP 
Dept of Math and CS | km@emory.bitnet              NON-DOMAIN BITNET  
Atlanta, GA 30322   | Phone: Voice (404) 727-7963, FAX 727-5611