Description: Apple II SCSI Card: Cable Pinouts (11/96)
Header: Apple II SCSI Card: Cable Pinouts (11/96)

 Article Created: 06 October 1986
 Article Reviewed/Updated: 15 November 1996

 TOPIC -----------------------------------------------------------

 Listed below are the pinout for the cable between the Apple II SCSI card and
 any standard SCSI system cable.

 DISCUSSION ------------------------------------------------------

 SCSI Card port                SCSI System Cable
 DB-25 connector               Apple 50 pin connector
 ---------------               ----------------------

 Pin     Signal                Pin
 ----    ------                ---
 1      REQ'  Request         49
 2      MSG'  Message         46
 3      I/O'                  50
 4      RST'  Reset           45
 5      ACK'  Acknowledge     44
 6      BSY'  Busy            43
 7      GND   Ground          16,18,19
 8      DB0'  Data Line 0     26
 9      GND   Ground          20,21,22
 10     DB3'  Data Line 3     29
 11     DB5'  Data Line 5     31
 12     DB6'  Data Line 6     32
 13     DB7'  Data Line 7     33
 14     GND   Ground          1,2,3
 15     C/D'  Carrier Detect  48
 16     GND   Ground          4,5,6
 17     ATN'  Attention       41
 18     GND   Ground          7,8,9
 18     DIFFSENS-GND          11
 19     SEL'  Select          47
 20     DBP'  Parity          34
 21     DB1'  Data Line 1     27
 22     DB2'  Data Line 2     28
 23     DB4'  Data Line 4     30
 24     GND   Ground          23,24,25
 25      TERMPWR              38


 Important SCSI Card Information
 ===============================
 The prime (') next to the signal name indicates the signal voltage levels are
 negative, "low true". The SCSI port uses -5V logic levels.

 Because the SCSI port is a DB-25 connector, it looks like a RS-232 port but
 is NOT a RS-232 port. DO NOT plug any RS-232 device into the SCSI port. Doing
 so can damage the 5380 chip on the card.


 Article Change History:
 15 Nov 1996 - Reviewed for technical accuracy, revised formatting.
 Copyright 1986-96, Apple Computer, Inc.
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