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Unread 30 Nov 2002, 16:53   #1
Razumny
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SysRq.
What is this button for?
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Unread 30 Nov 2002, 17:33   #2
the_angry_angel
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err, where?????
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Unread 30 Nov 2002, 17:36   #3
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It will launch Russian nukes at America....

LONG LIVE THE UNION!
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Unread 2 Dec 2002, 01:41   #4
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the Sys Rq. button, between F12 and Scroll Lock

seriously people, I am really curious...
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Unread 2 Dec 2002, 02:05   #5
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There is no standard use for the key. The BIOS keyboard routines in INT 16 simply ignore it; therefore so do the DOS input routines in INT 21 as well as the keyboard routines in libraries supplied with high-level languages.

Thus your program is free to use SysRq for its own purposes.




Not my writing, but the 1st thing that came up on Google. (Oh the difficulty :/).

Though clearly now a days its the Print Screen key, which on Windows at least, saves a copy of the screen to the clipboad.
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Unread 2 Dec 2002, 02:18   #6
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Google has been banned for the users of the LAN I'm on..

why does it say Sys RQ. then?
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Unread 2 Dec 2002, 10:22   #7
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Short for System Request if I remember right. It's hooked into interrupt 15 somewhere (can't remember AX values) and you can set up your own interrupt handler for that key to do whatever you want with it. Used to be great for debugging purposes, you could set up sysrq to dump all registers (or whatever other variables/whatever you wanted) to the screen at the press of a button. Great for those times you didn't have TDB handy
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Unread 2 Dec 2002, 14:26   #8
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BIOS
Int 15h Function 85h
System Request Key Pressed

Calling Registers: AH = 85h

Return Registers:
PC, PCjr
Carry flag set: AH = 80h

PX XT BIOS 11/08/82
Carry flag set: AH = 86h

All others
AL = 00h, key pressed
AL = 01h, key released

BIOS calls this function whenever the System Request key (Alt-Print Screen) is pressed or released.


Just reminds me how much I miss the days of DOS programming

=[DJ Bass]=
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Unread 2 Dec 2002, 14:28   #9
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Quote:
Originally posted by djbass
Just reminds me how much I miss the days of DOS programming
Me too I can't help with any of the Windows stuff but I can still remember what INT 21 is for \o/
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das blinkenlights!!!
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Unread 2 Dec 2002, 14:51   #10
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Quote:
Originally posted by Structural Integrity
LONG LIVE THE union REGS!
See.. even SI supports the cause

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