Int 15H [AT] [PS/2] Function 85H (133) SysReq key

Invoked by the ROM BIOS keyboard driver when the SysReq key is detected.

Call with:

AH = 85H

AL = key status

00H if key make (depression)

01H if key break (release)

Returns:

If function successful

Carry flag = clear

AH = 00H

If function unsuccessful

Carry flag = set

AH = status

Note:

The ROM BIOS handler for this function call is a dummy routine that always returns a success status unless called with an invalid subfunction number in AL. A multitasking program manager would be expected to capture Int 15H so that it can be notified when the user strikes the SysReq key.