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Connector pinout: SCSI External Centronics 50 (Single-ended) SCSI External Centronics 50 (Single-ended) pinouts pin name direction description color 1 GND Ground 2 GND Ground 3 GND Ground 4 GND Ground 5 GND Ground 6 GND Ground 7 GND Ground 8 GND Ground 9 GND Ground 10 GND Ground 11 GND Ground 12 RES Reserved 13 OPEN 14 RES Reserved 15 GND Ground 16 GND Ground 17 GND Ground 18 GND Ground 19 GND Ground 20 GND Ground 21 GND Ground 22 GND Ground 23 GND Ground 24 GND Ground 25 GND Ground 26 DB0 IN/OUT Data Bus 0 27 DB1 IN/OUT Data Bus 1 28 DB2 IN/OUT Data Bus 2 29 DB3 IN/OUT Data Bus 3 30 DB4 IN/OUT Data Bus 4 31 DB5 IN/OUT Data Bus 5 32 DB6 IN/OUT Data Bus 6 33 DB7 IN/OUT Data Bus 7 34 PARITY IN/OUT Data Parity (odd Parity) 35 GND Ground 36 GND Ground 37 GND Ground 38 TMPWR IN/OUT Termination Power 39 GND Ground 40 GND Ground 41 ATN IN Attention 42 n/c Not connected 43 /BSY IN/OUT Busy 44 /ACK IN Acknowledge 45 /RST IN/OUT Reset 46 /MSG OUT Message 47 /SEL IN/OUT Select 48 /C/D OUT Control/Data 49 /REQ OUT Request 50 /I/O OUT Input/Output