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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 ".
Click on the " FURTHER INFO " gadget ( BELOW ) to view the correct wiring of 50 Way SCSI
  
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
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
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
External SCSI Connector (Centronics 50- Female)
- 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
External SCSI Connector (Centronics 50- Female)
- 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
External SCSI Connector (Centronics 50- Female)
- s 1-12 and 14-25 are grounds.
- 26: *Data 0
- 27: *Data 1
- 28: *Data 2
- 29: *Data 3
- 30: *Data 4
- 31: *Data 5
- 32: *Data 6
- 33: *Data 7
- 34: *Parity
- 35: Ground
- 36: Ground
- 37: Ground
- 38: Terminator Power
- 39: Ground
- 40: Ground
- 41: *ATN
- 42: Ground (Unused?)
- 43: *BSY
- 44: *ACK
- 45: *RST
- 46: *MSG
- 47: *SEL
- 48: *C/D
- 49: *REQ
- 50: *I/O
2.5-Inch Drive S C S I Connector (40- Header)
- S 1, 2, 39, and 40 are +5V.
- s 3, 4, 37, and 38 are ground returns for the + 5V supply.
- s 5, 7, 9, 11, 13, 15, 19, 21, 23, 27, 31, and 35 are signal grounds.
- 17 is used as a connector key and should not be present.
- 06: *Data 0
- 08: *Data 1
- 10: *Data 2
- 12: *Data 3
- 14: *Data 4
- 16: *Data 5
- 18: *Data 6
- 20: *Data 7
- 22: *Parity
- 24: Terminator Power
- 25: *ATN
- 26: *BSY
- 28: *ACK
- 29: *RST
- 30: *MSG
- 32: *SEL
- 33: *I/O
- 34: *C/D
- 36: *REQ
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.
 
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.
This layout is Copyright © Unitech Electronics Pty. Ltd. 1985 - 2016
ONLY AMIGA MAKES IT POSSIBLE
 
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