=> R0 = 200 (&C8)
R1 = EOR value
R2 = AND value
<= R0 = preserved
R1 = state before being overwritten
R2 = keyboard disable flag (see OS_Byte 201)
This call can read, or change, the effects of a reset (including resets caused by Break) and of Escape.
The bottom two bits of R1 have the following significance:
Bit Value Effect
0 0 Normal escape action
1 Escape disabled unless caused by OS_Byte 125
1 0 Normal reset action
1 Power on reset (only if bits 2-7 of R1 are zero) This means a value of %00000001x causes a memory clear (no matter what kind of reset was pressed)
See PRM 1, page 879
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