Vsa Scsi Connectors - Data General AViiON Series Customer Documentation

External Device Connector Pin Assignments

VSA SCSI Connectors

SCSI devices connect to the VSA SCSI ports through 50-pin high-density connectors.
Figures C–6 and C–7 show the signals and pin numbers for VSA SCSI connectors for
single-ended and differential interfaces, respectively.
25
50
VSA
connector
(female)
1
26
NOTE: For single–ended SCSI connectors, pins 1 through 12 and pins 14 through 25 are
connected to ground. Pin 13 is left open.
Figure C–6 VSA SCSI Connector Signals – Single-Ended Interface
C-10
Pin Signal
26 Data Bus 0 (DB0)
27 Data Bus 1
28 Data Bus 2
29 Data Bus 3
30 Data Bus 4
31 Data Bus 5
32 Data Bus 6
33 Data Bus 7
34 Data Bus P
35 Ground (GND)
36 Ground
37 Ground
38 Termination Power (TERMPWR)
39 Ground
40 Ground
41 Attention (ATN)
42 Ground
43 Busy (BSY)
44 Acknowledge (ACK)
45 Reset (RST)
46 Message (MSG)
47 Select (SEL)
48 Control/Data (C/D)
49 Request (REQ)
50 Input/Output (I/O)
014–001867