外置SCSI接口(單端信号方式)

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SCSI 是 Small Computer System Interface 的(de)縮寫，外置式 50 針接口的(de)外觀爲母插座：

50 PIN CENTRONICS FEMALE

連接電纜插頭爲 50 針公插頭：
50 PIN CENTRONICS MALE

引腳定義

　

Pin Name Dir Description
1-25 GND --- Ground
26 DB0 <-> Data Bus 0
27 DB1 <-> Data Bus 1
28 DB2 <-> Data Bus 2
29 DB3 <-> Data Bus 3
30 DB4 <-> Data Bus 4
31 DB5 <-> Data Bus 5
32 DB6 <-> Data Bus 6
33 DB7 <-> Data Bus 7
34 PARITY <-> Data Parity (odd Parity)
35 GND --- Ground
36 GND --- Ground
37 GND --- Ground
38 TMPWR <-> Termination Power
39 GND --- Ground
40 GND --- Ground
41 /ATN <-- Attention
42 n/c - Not connected
43 /BSY <-> Busy
44 /ACK <-- Acknowledge
45 /RST <-> Reset
46 /MSG --> Message
47 /SEL <-> Select
48 /C/D --> Control/Data
49 /REQ --> Request
50 /I/O --> Input/Output