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From: farris@marlin.NOSC.MIL (Russell H. Farris)
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.laptops
Subject: ADDING 3.5" DRIVE TO SHARP PC-5401 LAPTOP
Keywords: 3.5" pc-4501
Message-ID: <1737@marlin.NOSC.MIL>
Date: 2 Apr 91 18:10:22 GMT
Distribution: usa
Organization: Naval Ocean Systems Center, San Diego
Lines: 32


      I added a Chinon 1.44mb disk drive to my single-drive Sharp
PC-4501 laptop and now the computer behaves very strangely.

      Either drive will work fine as A:, but neither will work
correctly as B: (or C:, or D:, etc.).  CHKDSK works for B: and
identifies it correctly as a 720k drive, but when I use DIR it
says B: is "not ready." I can COPY to B:, but I can't DEL files
from it.

      I am using a flat 34-pin cable with pin 15 clipped out (as
in the original Sharp cable).  Drive selection is by means of
jumpers/switches.  I am using MSDOS 3.3 and have tried the
following lines in my CONFIG.SYS file.

        device=driver.sys /d:1
        device=driver.sys /d:1 /f:2
        drivparm=/d:1
        drivparm=^a/d:1 /f:2

     There is no drive connected to the EXT FDD port, but I am
beginning to wonder if there is a some kind of conflict between
FDD drive assignments.

     Sharp will not sell their service manuals to individuals
(remember that when you think about buying a Sharp product) so
I'm completely stumped.  If you have had any success in solving a
problem like this, your help would be greatly apreciated.
Thanks,


Russ Farris         (farris@marlin.nosc.mil)   (619) 553-4129