=> R0 = host ID
<= R0 = SCSI data bus
R1 = Control lines, 1 = asserted :
Bit 7 6 5 4 3 2 1 0
RST BSY REQ MSG C/D I/O SEL DBP
R2 = Control lines, 1 = asserted :
Bit 7 6 5 4 3 2 1 0
X X X X X X ATN ACK
Returns the raw state of the SCSI control lines, where available.
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