ImageDisk / PC FDCs & single-density - test-drb@ccmp.vtda.org

22 Mar 2006

...
  -----Original Message-----
 From: Patrick Finnegan [mailto:pat at computer-refuge.org]
 Sent: Wednesday, March 22, 2006 9:04 PM
 On Wed, Mar 22, 2006 at 07:57:30PM -0500, Kelly Leavitt wrote:
   From:
Dave Dunfield [mailto:dave06a at dunfield.com]
 Sent: Wednesday, March 22, 2006 2:54 PM  
   This may
or may not help, but I have used a 1542c with 
 imagedisk to create mixed density floppies. Others have 
 then used these to successfully create new images.

 Interesting - I have a 1542 which does not work with 
 ImageDisk or TeleDisk/TESTSD
 at single-density - the user reporting the problems also has 
 a 1542 which does not
 work with any of the three programs ... Mine is a '1542CF' - 
 I assumed the 'F' ment
 "with floppy" ... Is this the same as yours?  

 Sorry, my confusion. I have used an Adaptec '1542B' (no F)   bios copyright
is
  1988 (checksum BB00) with mcode copyright 1990
(checksum   F3F7). I have read
  and written mixed density images using the floppy
portion of this
 controller. This is a 16-bit ISA SCSI controller with a big 50 pin
 centronics type connector on the bracket.  
 It might be more useful to know what kind of floppy chip it 
 uses, rather
 than what BIOS/uCode it has installed..
  National Semiconductor DP8473
52 pin plcc
Theoretically supports 4 drives. 
Datasheet:
http://www.ortodoxism.ro/datasheets/nationalsemiconductor/DS009384.PDF

Kelly