Conference hydra::amiga_v1

    I bought this drive NEW and it didn't come with any manuals. Come
    to think of it, most Harddrives I've obtained didn't come with
    documentation. If you get any I'd be VERY interested in a copy as
    well.
    
    In the meantime -- I managed to correctly install mine on my GVP
    Impaact II card, so I should be able to help. I couldn't tell you
    what all the jumpers are for, but I know the significant ones for
    installation. Basically:
    
    1) Set jumper to unit number desired -- should come correctly set
    for first unit.
    
    2) Remove resistor packs (3 or 4 of them if I remember correctly)
    unless it is being installed as unit #2 or greater and it is the last
    unit in the chain.
    
    Keith
    
    

Re: .0

Hard drives, as far as I can tell, never come with documentation.  I've
had three hard drives, and not a sheet of paper came with any of them
(well, the Seagate came with a sheet of paper that listed the results
of the final inspection of the drive).


Re: .1

>    2) Remove resistor packs (3 or 4 of them if I remember correctly)
>    unless it is being installed as unit #2 or greater and it is the last
>    unit in the chain.

I believe you remove the resistor packs if the drive is not the last
drive in the chain.  If this is your only drive, you leave the resistor
packs alone.  If this is your second drive, you remove the resistor packs
from the first drive, and leave them alone for the second.

I believe their are only two resistor packs, but I'm not sure.

>    1) Set jumper to unit number desired -- should come correctly set
>    for first unit.

Quantum ships the 105S from the factory jumpered to by unit 6.  There's
usually no problem with leaving this alone.  The one problem that I've
heard about is that some disk controller boards wait a long time when
probing for devices, and they may stall at boot time for a minute or
two if they have to go through 6 non-existent units before getting
to the real one.  (I believe the Commodore A2091 does not have this
problem).

(By the way, the reason for the long timeout before some disk controllers
will assume a disk unit is not attached to the bus is because the
controllers are giving sluggish Seagate drives time to spin up and
read their microcode from hidden tracks on the disk.)


Documentation is available for the asking from Quantum.  Call Quantum
and ask for the technical reference manual for the model of disk
you own.   The numbers for Quantum are:

Quantum (H.Q.) .................(408) 432-1100
extension 211 for ProDrive Marketing
Quantum (H.Q.) .................(408) 432-1102 x284 (Repair)
Quantum (Sales).................(408) 980-8555

    Thanks for the info so far.  I don't have the drive in my hands yet so
    can't look at it - and am eager to get the bits and pieces I'll need
    together so I can use it and test it real soon after delivery.
    
    Currently have an A500 with the Supra 500 SCSI interface, going to an
    Adaptec 4000 going to an RD51.  The SCSI connector on the Supra is 25
    pin.  Apparently the Quantum has a 50 pin connector.  Trying to figure
    out what sort of cable to make up or buy.
    
    Also, trying to figure out what sort of power cable/connector and power
    requirements.
    
    Also, "the story" is drive was pulled out of a new SUN config, and then 
    spun up on a MAC long enough to test it, so may have been configured to 
    some other address than Quantum's default for shipping.
    
    Perhaps  it will all get obvious when I have the drive in my hands to
    look at - but while I'm waiting I can think of lots of details to worry
    about.  The joys of buying used stuff, through the mail, from strangers, 
    in a foreign country, you know - you mail off a cheque and then sit and 
    wonder if this is the one time in n-times that you will be sorry.  Will
    I get a brick in the mail?  Did he drop it and have it roll down his
    basement stairs so now he's selling it?  I'm a little anxious to see it
    working, or at least hear it spinning, you see.

    Re: Resistor packs
    
    
    That's my usual understanding also, but the instructions that came
    with my GVP board said to pull if you are only running 1 drive,
    so I did. The drive works great.
    
    
    Re: unit number
    
    Ahhh, I think you're right -- it came as unit 6 and the jumper should
    be removed completely for unit 0.

>    with my GVP board said to pull if you are only running 1 drive,
>    so I did. The drive works great.
 
That's because gvp has the terminators soldered in their board.

SCSI  requires termination at both ends of the cable. This usually translates
to the controller and the last device on the bus.

With the gvp, if you use only internal devices, the gvp is at one end
and the last drive on the cable is at the other end of the bus. If you
add external devices (via the MAC 25 pin connection), the gvp ends
up in the middle of the cable - and you can't remove it's terminators!

They rely on the fact that the internal cable will be much shorter than
an external one do it *looks* like the gvp is at the end of the internal
end of the bus.

IMO, bad design but it was abviously a trade off between allowing the user
to yank termination off the board when appropriate, and having them follow
"simple" rules about which drives need termination.
    

    Here I am again.  Since I entered the base note, I've been running the
    Quantum as middle drive in a 2 drive chain on my 500.  Now I'm trying
    to move it to my 2000 where it will be the last (only) drive.  I need
    to terminate the drive.  I bought it used.  Didn't get any terminators.
    
    So, I'm trying to find out what part numbers, or values, or anything,
    the resistor networks used as terminators are.  I know they have 8
    pins, in a single in-line package, and there are 3 of them, labelled
    RPN 1, 2, & 3, located adjacent to the 50 pin cable.  The manual
    doesn't give any info about them except to say they come with the drive,
    and the only way I can figure to find out what they are is to see some 
    somewhere and get a part number off them.  There seems to be no standard 
    amoung manufacturers for them, of 4 SCSI devices in the house none use 
    the same terminators as the others.
    
    Called Quantum, got voice mail, left message, who knows when they'll
    call back.  Can anybody with a quantum (that's easy to get at) look at
    the terminators and provide me a part number?

	I've got a Quantum 210mg drive that I also got used. Unfortunately
	I can't help you since mine doesn't have terminators either. I would
	be interested in any info you get.

	Gail

    
    	There are two resistor packs that are used for SCSI termination.
    One type is the 8 pin single inline ( 3 packs to a set ). This is
    the most common. There is also a larger pack that only requires two
    packs to a set.
    
    	The DEC TLZ04, TZk10, TK50z all use the 8 pin 3 pack set. It seems
    that all quantum drives use the same pack. We have piles of them
    in the lab, I'll try to find a part number.
    
    		Steve P.
    
    P.S. I just spent weeks getting a supplier to remove the resistors
    before shipping the drives to DEC.
    

    The Quantum uses 3 of the 8 pin devices.  They are 220/300 ohm SIPs,
    device number 4608X-104-221/331, cost 42 cents each, and if you're
    willing to order 200 of them they will take 15 weeks to obtain through 
    Active Electronics if you are unlucky enough to live in Western Canada.
    Seems temination is on each SCSI signal line, and consists of
    connection to +5volts through a 220 ohm resistor and to ground through the
    330 ohm resistor.
    
    The 10 pin devices mentioned in the previous reply are also 220/330 ohm
    SIPs, device number 4610X-104-221/331 - these are used on my Adaptec.
    
    The Supra controllers I have use a terminator in a DIP package, different
    again.