http://www.nationalamiga.com/t-50-SCSI.html (Amiga Plus Extra No. 5/97, 05/1997)
50-Pin SCSI Connector
50-Pin SCSI Connection
This connection is usually found on the motherboard of a computer, or on a SCSI interface card.
Looking at a male connector on an interface.
Pin Name
50 I/O
48 REQ
46 C/D
44 SEL
42 MSG
40 RST
38 ACK
36 BSY
34 N.C.
32 ATN
30 Ground
28 Ground
26 Termination Power
24 Ground
22 Ground
20 Ground
18 Parity
16 Data 7
14 Data 6
12 Data 5
10 Data 4
08 Data 3
06 Data 2
04 Data 1
02 Data 0
All odd pins, except pin 25, are ground. Pin 25 is open.
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