Apple II 13-sector disks - test-drb@ccmp.vtda.org

26 Feb 2002

On Feb 26,  8:50, Sellam Ismail wrote:
...
  On Tue, 26 Feb 2002, Paul R. Santa-Maria wrote:

 > I have received a box of old Apple II disks including a bunch of 13-sector
...
  > disks.  It would be quicker if I could directly
boot these disks instead
...
   of using
BOOT13 or the Basics disk.  Does anyone here still have the
 13-sector boot PROMs for the Disk II controller card?  These are small
 256-byte PROMs; can anyone here burn them if I cannot find originals? 
 I've been searching for years and I don't think I've ever even seen a
 13-sector disk controller.  Just about everybody updated their old
 13-sector boot controller when the 16-sector version came out.

 I think I may actually have the 13-sector boot PROMs but where they are I
 wouldn't know.

 Here's an idea: boot trace the BOOT13 disk and grab the code from it.
 It's most likely just the old 13-sector disk controller PROM code.
 Alternatively, if you have a copy of the original Apple disk/DOS manual
 you'll find the 13-sector PROM code there.  Take this code and burn it
 into a PROM and swap it with the correct PROM on the 16-sector controller
 and it should work. 
As Sellam implies, it's only the boot PROM (P5) you need to change, not the
state machine PROM (P6).  I have a card somewhere with BOTH sets, switch
selectable, but I haven't seen it for a while.

The oher way to use the 13-sector disks is to make converted copies with
MUFFIN.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York