Re: To Ray Carlsen: How to disable the write protect sensor ?
                                       
   From: John Iannetta <76703.4244@CompuServe.COM>
   Reply to: John Iannetta
   Date: Sat, 05 Dec 1998 00:53:35 -0500
   Organization: CompuServe, Inc. (1-800-689-0736)
   References:
          <3667E772.1F192DCE@zaz.com.br>
Carlos,

    Several days ago, I posted an article in this thread about the CBM 1541
disk drive.  I discussed shorting out the write-protect phototransistor to
enable writing to unnotched disks.  And I said that, when changing disks,
either an INITIALIZE or a RESET command should be sent to the drive.  That is
because the drive would no longer be able to detect change-of-disk.  Then, in
the final paragraph of the article, I mentioned clipping pin 12 of UF5 (present
only in the original long board).  And I said that that would eliminate having
to do the INITIALIZE or RESET.  I was wrong; I apologize.  I didn't give that
idea enough thought.  I later realized that the hardware protection against
writing to an unnotched disk would be disabled, but that you would still get a
WRITE PROTECT ON error message.  So only the first method (shorting out the
write-protect sensor) should be used.  But remember to do either an INITIALIZE
or a RESET when switching disks.

--
                   John