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From: pbauer@athena.mit.edu (Paul H Bauer)
Newsgroups: comp.sys.apple2
Subject: Go Drive Info (long)
Date: 5 Oct 1993 02:36:12 GMT
Organization: Massachusetts Institute of Technology
Lines: 240
Distribution: world
Message-ID: <28qmis$gke@senator-bedfellow.MIT.EDU>
NNTP-Posting-Host: laika.mit.edu
Keywords: HD drives
Paul H Bauer (pbauer@athena.mit.edu) wrote:
: I am trying to use a 2.5" HD from a Power Book and am looking for
: the pin outs for the two connectors on the drive. One is a 50 pos. ide
: and the other is a 16 pos ide. I assume the 50 pos is a standard SCSI
: pinout????? but what is the 16 pos, power id ?
Wow, you're the second person tonight looking for a GoDrive pinout....
Tomorrow, I'll make some time to type it in and post it.
But you've confused me. If the drive came from a Powerbook, it's *NOT*
ide interface. IDE is an interface found in Intel/DOS boxes.
And no Go-Drive has a 50 pin connector. they have 40 + n pins,
(where 4<=n<=8). I guess it does *look* like an IDE connector,
but electrically, it's a whole different animal.
Also, when you speak of a 16 pin connector, do you mean one into which
a little Mylar flexible printed circuit attaches, which comes out from
inside the HDA (the mechanism). If so, these have nothing to do with
SCSI, and should be left alone.
What make/model drive are you dealing with? That will help me help you.
---gaylon
- * **
- * The drive I was refering to is a Conner 40 meg mechanism. **
- * **
Gaylon R Lovelace Jr Process Engineer
glovelac@qntm.com Quantum Corp. Customer Service
Everything above is my opinion, not Quantum's.
Following, please find the pinout table for GoDrive SCSI.
Don't try and use the same +5V (or return) for both motor and logic;
t'would be bad.
- * This does not seem to be a problem **
I'm not certain that the setup of J2 is the same for, say, a Conner
drive, but J1 should be identical.
- * It seems to be the same **
In my earlier response to this thread, my brain died. I said there is no
50 pin connector on the GoDrive. This is only sort of true. While we
think of there being two connectors, J1 & J2, they're both physically one
part. And if there weren't a bunch of missing pins, together they'd be
like a 50 pin connector.
Hope this helps.
----Gaylon
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 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
Recommended mating P/N: Dupont 69764-050 or equiv.
- * **
- * I found 24 and 28 pos dual row 2mm connecters from Digi-Key Corp **
- * 1-800-344-4539 **
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
Gaylon R Lovelace Jr Process Engineer
glovelac@qntm.com Quantum Corp. Customer Service
Everything above is my opinion, not Quantum's.
This seems to be a popular topic, so here's some
more info....
----Gaylon
Gaylon R Lovelace Jr Process Engineer
glovelac@qntm.com Quantum Corp. Customer Service
Everything above (and below) is my opinion, not Quantum's.
Power Requirements for GoDrive 80S
Voltage +5V +-5%
Current:
Sleep/Standby 0.04A
Parked (actuator off, spindle on) 0.16A
Idle (track following) 0.34A
Active: Reading/Writing 0.40A
Active: Seeking 0.44A
StartUp (peak) 1.10A
Ripple & Noise 50mV
For a one disk unit (40S, 60S, GRS 80S, GLS 85S), the peak draw at startup
is more like 0.90A.
I am not an expert on termination, or even on SCSI generally, or on much
of anything, to be honest. But perhaps this info will help. In testing
operations, we use a little interface board which plugs on to the GoDrive
and presents a standard SCSI ribbon connector, so that the GoDrive and
adapter board together appear, electrically, to be just like any 3.5 inch
SCSI drive. We have termination resistor packs on that adapter board, so
I assume that means termination must be done external to the drive. I've
never seen the inside of a Powerbook (I'm saving my pennies), but I assume
there must be termination built onto the motherboard.
The GoDrive 40/80 S product manual (copyright 1991, Quantum Corp., etc)
says the following about Vterm:
GoDrive supplies terminator power through a Schottky diode and a 1A
fuse:
Vterm=
4.25V DC to 5.25V DC
150 mA min with 1K pullup resistors
800mA min source drive capability, if supplying external terminators
1.0 mA max sink capability, except when providing power to an internal
terminator
1.0A current limiting (fuse)
I don't pretend to fully understand all the earth-shattering implications
of all those specs, but there they are. If anyone feels able to explain
it all, feel free to followup with something on the details of SCSI
termination.
On the connector pinout which I posted, there separate pins for Logic
Return, Motor Return, and ground. And I pointed out that you should
keep the logic and motor lines seperate. I just looked at two different
versions of our adapter boards, and both connect all returns to common
ground, and connect both motor and logic to a common +5V. Personally,
I would be concerned with the motor draw pulling the logic +5 down too
low, or dirtying it up. Perhaps that is not quite such a big worry after
all. However, I should point out that we generally use these with very
capable (big) power supplies. Linear, not switching. So as you put these
setups together, if you have problems with drive logic blips, think
about that ripple & noise spec.
The power specs should be similar for non-Quantum drives. As for extra
connectors (16 pin) on Conner drives: Quantum GoDrives are what we call
self-scan, which means the 8 hour digital scan (the last step in the
testing process which we inflict on every drive, before we ship) is run
not by an externally connected test computer, but by the microcontroller
on the drive itself. We connect the drive to a computer, and load
all the test software onto the disk. Then we put the drive in an oven,
with only power connected, and it tests itself. Then we connect it to
another computer and read the test results back off the disk.
Pins 1-4 of J2 (the other end of the 2 x 25 ribbon connector) are reserved
(on Quantum drives) for signals involved in this test process.
Conner drives are self-scan, too. Perhaps they have the extra connector
for this same sort of purpose. Just a guess. But whatever it is, you
shouldn't need it to use the drive. I think....
The GO drive that I installed internally in my GS has a peak start up
power of 685 mw and typical running power of 335 mw. This is all off of
the 5 volt supply. 13 watts off of a 5 volt supply would be about 2.6 amps
and the If you have to buy a new drive it may not be any cheaper. I found
an add from a person who had upgraded her power-book from a 40 to an 80meg
hd and had the old 40 meg drive for sale for $50. At that price I couldn't
pass it up because I had wanted to make this mod as an exercise for
several months and this provided the opertunity. I had an extra SCSI card
(RamFast C) and once I was able to get the pin-outs for the 2.5 drive
(much different than standard 3.5" SCSI drives and the 2mm connecters it
was about a 2 hour job to make the installation including an external 25
pin D connector for connecting other SCSI devices. The only caveat in this
is the SCSI has to be able to recognize a drive that has not come up to
speed when the computer is turned on since the drive is running off the
same power supply. The RamFast has this capability as well as the older
apple rev C SCSI cards I believe.
If anyone is interested in doing this I can provide them with the
electrical info for the 2.5" drives.
(SEE ABOVE)
The thanks for this info goes to a very helpful customer tech rep
at Quantum Hard drives.