=> R0 = 247 (&F7)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = value before being overwritten
R2 corrupted
This call reads and changes the result of pressing Break. The value byte alters Break and modifiers of it as follows:
Bits Key combination
0,1 Break
2,3 Shift Break
4,5 Ctrl Break
6,7 Ctrl Shift Break
Each two bit numbers can mean one of these:
Value Meaning
00 Act as reset
01 Act as escape key
10 No effect
11 undefined
The default is %00000001, so Break causes an escape condition, together with Shift and/or Ctrl it acts like the reset button. Please note that this SWI also alters the CMOS when writing a new status.
See PRM 1, page 902
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