8 Apr
2008
8 Apr
'08
4:19 p.m.
Thanx for the info!
J. David Bryan wrote:
HP-1000 w/13175/13178 <cable-a> 13075 <cable-b> 7905/06/20/25 yes?
What are cable-a and cable-b? dual 50 pin card edge on both ends of both
cables?
ah!
I forget which pdf I read that number in. I think it was one of the
13037 documents. Can the 26xx terminals also speak GP-IB?
I'm confused. See previous "connected together" comment.
Thanx for the reply! Things are getting clearer.
I picked up a National Instruments GPIB-SCSI converter. That could add
whole new monkey wrenches to the picture. :) The docs say it'll drive in
one direction or the other. ie: a machine with a scsi bus can talk to
gpib devices through it, or a machine with a gpib bus can see scsi
devices. It appears that it's one or the other, not both.
--
Tim Riker - http://Rikers.org/ - TimR at Debian.org
Embedded Linux Technologist - http://eLinux.org/
BZFlag maintainer - http://BZFlag.org/ - for fun!
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On 7 Apr 2008 at 16:48, Tim Riker wrote:
Got a pointer to docs on that?
I understand that HP-7920 and HP-7925 drives were
AMIGO flavor GP-IB
drives.
No, these drives used the MAC command set. I'm not
quite sure where the GP-IP buss comes in the picture.
There were effectively three different interface systems employed by the
79xx series of drives.
The 7905/06/20/25 drive systems debuted the MAC (Multi-Access Controller)
command set. This used a 13037 controller box, one to eight drives, and
one to eight CPU interfaces. There were master and slave versions of each
drive (e.g., 7925M, 7925S, etc.) -- the essential difference being that a
master drive came with the 13037 controller and the slave did not; the
drives otherwise were identical. Interface to the HP 1000 was via the
13175 card for the first computer and 13178 card for the rest (the only
differences were cabling and termination resistors on the 13175 card). Later, an HP-IB option was added via the 12745 card.
This card was
inserted in the 13037 box and provided an HP-IB connector at the rear of
the chassis. Connection to the HP 1000 was via the 12821 disc interface
card, rather than the 13175 card. With the HP-IB option, the multi-CPU
capability was lost, although up to eight drives could still be connected
to the single CPU. The MAC command set was retained, although it was now
transferred via HP-IB. Note that the addition of the 12745A card did not
change the command set to CS/80.
So now we have:
HP-1000 w/12821 <cable-c> 13075 w/12745 <cable-d> 7905/06/20/25
where cable-c is a 50-pin to gp-ib? and cable-d is as cable-b above?
Finally, to provide lower-cost installations, the
"H" series of ICD
(Integrated Controller Disc) products was introduced (e.g., 7925H). These
dispensed with the 13037 controller box and added a controller card within
the drive itself, presenting an HP-IB connector on the rear of the drive
chassis. Up to four such drives could be connected together, and they used
the same 12821 interface for connection to a single HP 1000. The MAC
command set was still employed, although three of the commands dealing with
multiple CPUs and error correction (the 13037 provided ECC; the ICD
controllers did not) were deleted.
HP-1000 w/12821 <cable e> 7925H
so I presume cable-e is 50 pin card edge to GP-IB?
You say the drives could be "connected together". Is this just a normal
GP-IB bus? or are there still a unit number here?
There is
normally a contoller (13037-60028) interface...
That's the Device Controller PCA number, one of three cards within the
13037 chassis (or four, if the 12745 HP-IB option were added). ...between the
drives and the host computer interface (02640-90042?)
I don't recognize that number at all, although 02640-xxxx should be a 264x
terminal part number. How does the
shared storage through a 13037 controller work? are they
all just IDs on GB-IB?
The 13037+12745 controller appeared as a single HP-IB device; the attached
drives were addressed via the "U" (unit number) field of the appropriate
MAC commands. Each ICD controller had its own HP-IB address; the unit
number fields with the commands were not used.