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Chapter 1 Hardware Installation 37
Step 11 Connect SCSI I/O, Continued
50-Pin Low-Density SCSI Connector The MegaRUM motherboard includes a 50pin low-density
0.0100” pitch shrouded SCSI connector for each SCSI channel. The pinout for
the 50-pin low-density connector is specified in SCSI-2 X39T9.2 project 375R,
revision 10K, April 28, 1993.
50-Pin Low-Density SCSI Connector Pinout
Signal Connector Pin Cable
Pin
Cable
Pin
Connector Pin Signal
Ground 1 1 2 2 -DB(0)
Ground 3 3 4 4 -DB(1)
Ground 5 5 6 6 -DB(2)
Ground 7 7 8 8 -DB(3)
Ground 9 9 10 10 -DB(4)
Ground 11 11 12 12 -DB(5)
Ground 13 13 14 14 -DB(6)
Ground 15 15 16 16 -DB(7)
Ground 17 17 18 18 -DB(8)
Ground 19 19 20 20 -DB(P)
Ground 21 21 22 22 Ground
Reserved 23 23 24 24 Ground
OPEN 25 25 26 26 Reserved
Reserved 27 27 28 28 TERMPWR
Ground 29 29 30 30 Reserved
Ground 31 31 32 32 Ground
Ground 33 33 34 34 -ATN
Ground 35 35 36 36 Ground
Reserved 37 37 38 38 -BSY
Ground 39 39 40 40 -ACK
Ground 41 41 42 42 -RST
Ground 43 43 44 44 -MSG
Ground 45 45 46 46 -SEL
Ground 47 47 48 48 -C/D
Ground 49 49 50 50 -REQ
Cont’d