From: Brendan Simon <brendan AT rdt DOT monash DOT edu DOT au>
Date: Fri, 5 Jan 1996 13:27:42 +1100
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: interrupt help please


I have been using a data aquisition card for about a year now in a
couple of projects.  It uses the IRQ lines to service the A2D stuff.
I am using DJGPP v2b2.  I thought I had got on top of all the issues
related to interrupts but alas the problems of machine crashes and
page faults have come back to haunt me.

whenever I get an interrupt (even if set at once a second via signal generator)
I get the following error message :-

Page fault at eip=250037; flags=3046
eax=002400b7 ebx=00268e00 ecx=0000345c edx=00000033 esi=000276fc edi=000034a8
ebp=0024e14c esp=00268e00 cs=a7 ds=b7 es=b7 fs=b7 gs=b7 ss=b7 error=0006

The code has been lifted from a known working program.  There are only
two real differences that I see as being possibly relevant.

1) the setting up of the interrupt vectors were moved from the file containing
   main() into a subroutine of another .c file.  (big deal, should be OK ??)

2) I have a different A2D card (same model, just another card)

Can someone please give me a pointer to what the error message above means.

Brendan Simon
brendan AT rdt DOT monash DOT edu DOT au