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The information contained herein is to be used as a guide only. It is believed to be accurate, Always check first.
Disclaimer :
We take no responsibility for any errors or omissions made on any of these pages, they are provided " as is ".

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     S C S I    Pin-Outs

     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


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     External SCSI Connector (DB25 Macintosh-Type Female Pseudo-SCSI)
     (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


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     External SCSI Connector ( DB25 Future Domain-Type Female Pseudo-SCSI )
     (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


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     External SCSI Connector (Centronics 50- Female)



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     External SCSI Connector (Centronics 50- Female)



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     External SCSI Connector (Centronics 50- Female)



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     2.5-Inch Drive S C S I Connector (40- Header)



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To the Further SCSI Info page

Disclaimer: The information contained herein is believed to be accurate.
No responsibilities are taken for errors or omissions.
Current from June 19th 1998 - Note: There will be no further updates to this page.

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Disclaimer: The information contained herein on this web site is believed to be accurate.
No responsibilities are taken for typographical errors or omissions or errors of any kind.

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