SCSI CABLE HEADER INFO

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Internal SCSI Port (50-Pin Header)

External SCSI Connector (High-density 50-pin) See External SCSI Connector.

All odd pins are " grounds " , except for pin 25, which is unused eg:

• 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49.

• 02: *Data 0
  
• 04: *Data 1
  
• 06: *Data 2
  
• 08: *Data 3
  
• 10: *Data 4
  
• 12: *Data 5
  
• 14: *Data 6
  
• 16: *Data 7
  
• 18: *Parity
  
• 20: Ground
  
• 22: Ground
  
• 24: Ground
  
• 26: Terminator Power
  
• 28: Ground
  
• 30: Ground
  
• 32: *ATN
  
• 34: Ground (Unused?)
  
• 36: *BSY
  
• 38: *ACK
  
• 40: *RST
  
• 42: *MSG
  
• 44: *SEL
  
• 46: *C/D
  
• 48: *REQ
  
• 50: *I/O

(Note:) This is by far the most common style of DB25 SCSI connector.
Most ( and probably all ) Amiga SCSI interfaces with DB25 connectors--like the A2091, GVP, Phase V etc( use this pin-out ).

• 01: *REQ
  
• 02: *MSG
  
• 03: *I/O
  
• 04: *RST
  
• 05: *ACK
  
• 06: *BSY
  
• 07: Ground
  
• 08: *Data 0
  
• 09: Ground
  
• 10: *Data 3
  
• 11: *Data 5
  
• 12: *Data 6
  
• 13: *Data 7
  
• 14: Ground
  
• 15: *C/D
  
• 16: Ground
  
• 17: *ATN
  
• 18: Ground
  
• 19: *SEL
  
• 20: *Parity
  
• 21: *Data 1
  
• 22: *Data 2
  
• 23: *Data 4
  
• 24: Ground
  
• 25: Terminator Power

(Note: This is a rare alternate standard for the DB25 connector. It
was only used on the Future Domain TMC-830/845 and TMC-850/860/885,
and is included here in case you have a cable meant for these boards.)

• 01: Ground
  
• 02: *Data 1
  
• 03: *Data 3
  
• 04: *Data 5
  
• 05: *Data 7
  
• 06: Ground
  
• 07: *SEL
  
• 08: Ground
  
• 09: Terminator Power
  
• 10: *RST
  
• 11: *C/D
  
• 12: *I/O
  
• 13: Ground
  
• 14: *Data 0
  
• 15: *Data 2
  
• 16: *Data 4
  
• 17: *Data 6
  
• 18: *Parity
  
• 19: Ground
  
• 20: *ATN
  
• 21: *MSG
  
• 22: *ACK
  
• 23: *BSY
  
• 24: *REQ
  
• 25: Ground