[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: SCSI CABLE Info needed
* 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