Path: news.uiowa.edu!uunet!usc!howland.reston.ans.net!spool.mu.edu!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!pbauer From: pbauer@ATHENA.MIT.EDU (Paul H Bauer) Newsgroups: comp.sys.apple2 Subject: Re: SCSI CABLE Info needed Date: 10 Apr 1995 01:28:21 GMT Organization: Massachusetts Institute of Technology Lines: 143 Message-ID: <3ma1jl$rs1@senator-bedfellow.MIT.EDU> References: NNTP-Posting-Host: bolognese.mit.edu * I need to construct a couple of cables and would like to know if someone * else has already done this. I need to construct a ribbon cable to connect * a 50 pin on one end (hard drive) to 25 pin on the other end (SCSI CARD) so * that I can connect internally from my SCSI card to a hard drive. * The other one is more difficult, I want to go from the same 25 pin ribbon * from a SCSI card to the smaller powerbook style hard drive connector. * Anyone already done this? I know I can figure it out but if someone else * has already made these cables, It would save me some time. Thanks to * anyone who replies or helps out. SCSI pinouts: 25 pin ident 50 ide 50 SCSI RIBBON GODrive 1 REQ 48 49 36 2 MSG 42 46 30 3 I/O 50 50 33 4 RST 40 45 29 5 ACK 38 44 28 6 BSY 36 43 26 7 GND 37 19 8 DB0 2 26 6 9 GND 39 20 10 DB3 8 29 12 11 DB5 12 31 16 12 DB6 14 32 18 13 DB7 16 33 20 14 GND 1,3,5 1,2,3 15 C/D 46 48 34 16 GND 7,9,11 4,5,6 17 ATN 32 41 25 18 GND 13,15,17 7,8,9 19 SEL 44 47 32 20 DBP 18 34 22 21 DB1 4 27 8 22 DB2 6 28 10 23 DB4 10 30 14 24 GND 45,47,49 23,24,25 25 TPWR 26 38 24 GODrive pins 5,7,9,11,13,15,19,21,23,27,31,35 = GND pins 1,2 +5 volts Logic pins 3,4 Logic return (GND) pins 39,40 +5 volts motor pins 37,38 motor return IDE 50 pin connector "into drive" 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 50 PIN SCSI Ribbon connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 ____________________________________________________________________________ \ o o o o o o o o o o o o o o o o o o o o o o o o o / \o o o o o o o o o o o o o o o o o o o o o o o o o/ ------------------------------------------------------------------------- 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Pinouts for Quantum GoDrive SCSI: This is excerpted, sort of, from the _Go-Drive_40/80S_Product_Manual_, copyright 1991 by Quantum Corp. The connector is a single 2 x 25 connector on 2mm centers for power,data and SCSI device address. The connector also includes four pins (pins 1-4 of J2) which are reserved as factory test points. J1 J2 Pin39 Pin17 Pin1 Pin1 | | | / o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o | | Pin40 Pin2 To prevent the possibility of incorrect installation, the hole of the mating ocnnector that corresponds to pin 17 of J1 should be plugged. Max cable length = 12" Pins 5-7 of J2 are used for hardware selectable device address as follows: Pin 5 Pin 6 Pin 7 SCSI id ----- ----- ----- ------- hi hi hi 0 lo hi hi 1 hi lo hi 2 lo lo hi 3 hi hi lo 4 lo hi lo 5 hi lo lo 6 lo lo lo 7 Pin 8 of J2 can be used to drive an LED during periods of drive activity. Signal Pin Signal Pin ----------- ---- ----------- ---- +5V (logic) 1 +5V (logic) 2 Logic return 3 Logic return 4 GND 5 DB0 6 GND 7 DB1 8 GND 9 DB2 10 GND 11 DB3 12 GND 13 DB4 14 GND 15 DB5 16 KEY 17 DB6 18 GND 19 DB7 20 GND 21 Parity 22 GND 23 Termination Power 24 -ATTN 25 -BSY 26 GND 27 -ACK 28 -RST 29 -MSG 30 GND 31 -SEL 32 -I/O 33 -C/D 34 GND 35 -REQ 36 Motor Return 37 Motor Return 38 +5V (motor) 39 +5V (motor) 40 pbauer@mit.edu