[no subject]

There are a number of programs around with hard-coded branches into the slot
5 I/O routines - the programmers just *knew* that slot 5 was the disk
controller, so why would anyone put another card in there?  :-)

Programs that follow Apple's guidelines for calculating the relevant entry
point continue to work correctly, of course.

--
Peter Watson
-- Write to MSDOS disks on the Apple IIgs?
-- Impossible!  ;-)

"David Empson" <dempson@actrix.gen.nz> wrote in message
1fobhiv.lfkiixskmbdmN%dempson@actrix.gen.nz">news:1fobhiv.lfkiixskmbdmN%dempson@actrix.gen.nz...
> Tim Haynes <timhaynes@alumni.NO.SPAM.PLEASE.uwaterloo.ca> wrote:
>
> > Hmmm... I posted about the FTA Weaky demo not loading properly on my
> > Suerdrive controller-enabled ROM 01 IIgs.  It turns out that any Pascal
file
> > system floppy disk will boot into a '3.5" Disk Controller Test' on this
> > machine.  This prevents such floppies from booting.  Does anyone have
any
> > suggestions for getting around this self test so that the disk actually
> > boots??
>
> It sounds like the built-in self test of the SuperDrive controller is
> being invoked when Pascal attempts to boot.  The test software has a
> specific entry point somewhere near the start of the $Cn00 area, but it
> isn't documented in the user manual so I'd have to go hunting for more
> detailed information.  Pascal must be calling this location (or
> something which falls into it) during the boot sequence.
>
> The most likely issue is the slot in which the SuperDrive card is
> installed.  If the card is in slot 4, 5 or 6 then Pascal knows to treat
> it as a disk controller.  (Pascal 1.3 will be able to use the SuperDrive
> card, but earlier versions will ignore it because it doesn't look like a
> 5.25" controller.)
>
> If it is in slot 1 or 2, then Pascal will try to treat it as a printer
> or modem interface respectively, and may be attempting to call specific
> entry points on the card to initialize it.  If this is the case then
> your options are to either disable the slot before attempting to boot a
> Pascal disk, or move the SuperDrive card to slot 4, 5 or 6.
>
> Slot 3 would have the same problems as 1 and 2 - Pascal expects the
> primary text I/O device to be there (80 column card or something like a
> serial interface for an external terminal).
>
> Pascal ignores slot 7 unless you are running special drivers, so you
> could put the SuperDrive card there if you want to completely ignore it
> in Pascal.
>
> --
> David Empson
> dempson@actrix.gen.nz