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Date: Sun 09-Oct-1991 06:29:15 From: jms@tardis.Tymnet.COM (Joe Smith) Subject: Connecting Sun disk/tape to Amiga or Mac Connecting a Sun "ShoeBox" to an Amiga or a Mac. I have successfully connected a Sun ShoeBox with 669 meg disk and 60 meg 1/4-inch tape drive to my Amiga. This particular setup also worked on a Mac II, and should work with other small computers that use a DB-25 connector as the SCSI port (such as NeXT). Pin numbering conventions: ________________________________________ DB-25 ( 13 12 11 10 09 08 07 06 05 04 03 02 01 ) As viewed from back socket \ 25 24 23 22 21 20 19 18 17 16 15 14 / side of Amiga or Mac -------------------------------------- ______________________________________________________ DD-50 ( 49 46 43 40 37 34 31 28 25 22 19 16 13 10 07 04 01 ) As viewed from socket \ 48 45 42 39 36 33 30 27 24 21 18 15 12 09 06 03 / back side of \50 47 46 41 38 35 32 29 26 23 20 17 14 11 08 05 02/ Sun ShoeBox -------------------------------------------------- I used a rainbow colored 50-conductor flat ribbon cable, a male DB-25 connector, and a male DD-50 connector. I got the "solder it yourself" type connectors; if I were to do it again I would use a crimp-on 50-pin plug. DB-25 Description DD-50 Unused pins on DD-50 1 -REQ 48 19+20,21+22,23+24 2 -MSG 42 25 not used (26 is terminator power) 3 -I/O 50 27+28,29+30,33+34 4 -RST 40 5 -ACK 38 Note: all active even numbered 6 -BSY 36 pins (2n) have a corresponding 7 GROUND 1+3+5 ground wires (2n-1). 8 DATA-0 2 9 GROUND 7+9+11 If you're paranoid, you might want 10 DATA-3 8 to avoid the use of pin 25 on the 11 DATA-5 12 DB-25 and pin 26 of the DD-50. 12 DATA-6 14 This is because external SCSI disk 13 DATA-7 16 boxes have this pin grounded, 14 GROUND 45+47+49 instead of using it to supply 15 -C/D 46 +5 volts to the termination 16 GROUND 39+41+43 resistors. 17 -ATN 32 18 GROUND 31+35+37 19 -SEL 44 20 PARITY 18 21 DATA-1 4 22 DATA-2 6 23 DATA-4 10 24 GROUND 13+15+17 25 TERM-POWER 26
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Marcel Waldvogel and Netfuture.ch.