🚀 go-pugleaf

In article <1996Feb1.125721.18589@ucl.ac.uk>, zcaccau@cs.ucl.ac.uk (Chris Austin) writes:
> In modula-2 is there any way that you can determine whether a floppy drive
> currently contains a disk and whether it is correctly formatted,  (i.e.
> whether the drive is readable), without getting the DOS abort, retry or
> ignore message.  I would like this to work with CD's, IOMEGA ZipDrives,
> etc... as well.  I have looked through a list of interrupts, but am unable
> to find one to do this.  I am able to tell whether the drive exists, by
> using the setdrive & getdrive interrupts.
>
> Any help would be appreciated.

To expand on the two other responses, (and I hope I'm not talking
down to you here) Int24 is the DOS Critical Error Handler. It isn't
handled quite like other interrupts, and it isn't exited quite like
other interrupts.

It probably is the best way for you to go, and as someone said, the
JPI compiler includes a sample Int24 handler. I'm not sure if you
can call it from inside the Int24 handler, or if you have to wait
(probably) until the Int24 handler and the failed DOS call return,
but there is another call (I forget the number) that will return
extended fail information. This may help you get more of what you
need to know, as well.

I once used the JPI sample Int24 handler as my starting point for
a TSR, since it showed how to completely capture registers on call,
and with minor changes could switch to its own stack. Someone offered
to email this code to you. Watch out, it has a JPI copyright.
Especially if you want to ship/sell something based on it you should
acquire a legitimate copy. (I think it's in the Tech-Kit)

Dale Pontius
(NOT speaking for IBM)