=> R0 = 201 (&C9)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = flag before being overwritten
R2 corrupted
This call enables or disables the keyboard. 0 will enable the keyboard (as normal). Any other value will stop the interrupt routine inserting keypresses into the keyboard buffer.
See PRM 1, page 881
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