=> R0 = 197
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = value before being overwritten
R2 = corrupted
Note, that *FX 12,0 resets the auto repeat rate/delay to default *FX 197,0 sets the auto repeat rate to zero. See OS_Byte 12 for more information.
See PRM 1, page 875
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