Date: Sat, 9 Sep 1995 21:57:21 -0500 (CDT)
From: Leroy Rakoski <lrakoski AT isbe DOT state DOT il DOT us>
Subject: Pause Key
To: djgpp AT sun DOT soe DOT clarkson DOT edu

This may be more of a DOS interrupt question, but...
Watcom C (DOS4GW) traps or lets you trap the Pause Key on extended 
keyboards.  (look at doom, for ex).. I looked at Ralf Brown's excellent 
interrupt list, and it said pause has scancode 0xE1 going into INT 0x9 
(IRQ1).

How would you trap this in DJGPP (safely) and have it set a flag or call 
a function... (v2 preferred over v1.12!)

i know how to trap SysReq - just hook int 0x15, ah=85.

maybe the solution for pause would be to put in a hook at 0x15, ah=4f and 
test for 0xE1 and not return it to int 0x9

*** int 0x9 calls int 0x15, ah=4f with al= scan code, and cf set.  if you 
do not want the key to be processed by 0x9, set cf cleared.  you can even 
change scancodes into other scancodes!! ***

would it be better to hook int 0x9 or 0x15 ah=4f?

is there a better way??

thanx
Lee Rakoski
lrakoski AT isbe DOT state DOT il DOT us