Newsgroups: comp.sys.ibm.pc.hardware
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!unixg.ubc.ca!cchen
From: cchen@unixg.ubc.ca (Chia-tung Chen)
Subject: TEAC 3 1/2" 720 K floppy for XT
Message-ID: <1991Apr14.205938.6817@unixg.ubc.ca>
Summary: what is the problem? Jumper switches? or software? 
Sender: news@unixg.ubc.ca (Usenet News Maintenance)
Nntp-Posting-Host: chilko.ucs.ubc.ca
Organization: University of British Columbia, Vancouver, B.C., Canada
Date: Sun, 14 Apr 1991 20:59:38 GMT


Dear Usenet users:
  I have some problem with the 3 1/2" 720 K TEAC FD-235F floppy drive on my
XT that I hope some of you can solve. I use DOS V4.01 and driver.sys /d:1
in my CONFIG.SYS to let the DOS recognize that this is a 720 K drive.

  The problem I have is if I format a disk at home on this drive, I can only
format it successfully under d:. That is fine, but whatever disks I format
at home is not guaranteed to work on other machine at school. The machines
at school at usually 386 machines with 1.44 meg drive. The machines at school
either give me "FILE NOT FOUND" indicating there is no files on the disk, or
"GENERAL FAILURE" indicating the disk is totally unreadable. However, the disk
that I format at school generally have no problem when I bring it home. But, if
I write something onto that disk, it is not working again on school's machine.

  So, I suspect it is because the jumper switch is not set properly on the
drive. I am using the drive on an XT and use it as a B (second) drive. There
is also a 3-pin jumper on the disk connector. Could anyone check the jumper
swithch setting for me? Are they set properly? They are shown below in the
diagrams. If they are right, then is there any thing I do wrong in having the
DOS recognizing this 720 K drive?

  My mail address is cchen@unixg.ubc.ca. Thank you very much in advance.

                            a confused XT user,
                                    chia-tung chen

========================================================
|                                                      |
|     ---------------------------------------          |
|    |              FRONT DOOR               |         |
|    |                                       |         |
|    |                                       |         |
|    |                                       |         |
|    |                                       |         |
|    |                                       |         |
|    |                                       |         |
|     \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/           |
|                                                      |
|     \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ |         |
|    |  o  o   MS                            |         |
|    |                                       |         |
|    |  o  o   IR                            |         |
|    | |-|                                   |         |
|    | |o| o   RY                            |         |
|    | | |                                   |         |
|    | |o| o   DC                            |         |
|    | |-|                                   |         |
|    | ------                                |         |
|    | |o  o|  D1                            |         |
|    | ------                                |         |
|    |  o  o   D0                            |         |
|    |                                       |         |
|    |  o  o   FG <- CAPACITOR               |         |
|    |---------------------------------------|         |
|             BACK OF THE DRIVE                        |
|                                                      |
+------------------------------------------------------+
|   DIAGRAM OF THE CURRENT JUMPER SWITCH SETTING       |
========================================================

========================================================
|                        disk connector                |
|                | | | | | | | | | | | | | | | | |     |
|                | | | | | | | | | | | | | | | | |     |
|                | | | | | | | | | | | | | | | | |     |
|                | | | | | | | | | | | | | | | | |     |
|                | | | | | | | | | | | | | | | | | 2   |
|               /  |          ...                |     |
|    0 ---------   |          ...                |     |
|       =======    |          ...                |     |
|    1 -|-----|-\  |          ...                |     |
|       |     |  | |          ...                |     |
|    2 -|-----|-/| |          ...                |     |
|       =======  o o o o o o o o o o o o o o o o o     |
|      jumper    o o o o o o o o o o o o o o o o o     |
|                                                      |
+------------------------------------------------------+
|        JUMPER SWITCH ON THE DISK CONNECTOR           |
========================================================