Pin Signal Pin Signal 1 GND 2 Data Line 0 3 GND 4 Data Line 1 5 GND 6 Data Line 2 7 GND 8 Data Line 3 9 GND 10 Data Line 4 11 GND 12 Data Line 5 13 GND 14 Data Line 6 15 GND 16 Data Line 7 17 GND 18 Data Parity Line 19 GND 20 GND 21 GND 22 GND 23 GND 24 GND 25 N/C 26 Terminator Power 27 GND 28 GND 29 GND 30 GND 31 GND 32 Attention 33 GND 34 GND 35 GND 36 Busy 37 GND 38 Acknowledge 39 GND 40 Reset 41 GND 42 Message 43 GND 44 Select 45 GND 46 C/D 47 GND 48 Request 49 GND 50 I/O