Hi Joe,
I have a friend that used to work on/with the Unisys
stuff. I have
most of a machine in my basement, but never fired it up. He also has a
complete machine, and hasn't fired it up recently, but believes it will
run. I forwarded Dave's original email to him and he replied below. If
any of you need further help, let me know and I'll pass the questions on
to him and he might answer directly. His big thing is that he already
gets a ton of email (good,bad and ugly) and is cautious about getting
more, or joining the group. Very interesting about what he says about
booting from the floppy. He used to support a bunch of these machines,
so I am pretty sure he knows his stuff, but to not boot a floppy is unique.
Please thank him for the wealth of info - if you could pass on my questions
below, I'd appreciate it. I'd like to see this thing running, and I think it's
"almost
there", but it would appear that I still need some things...
If he is willing, I would very much appreicate corresponding with him
directly - please forward my email address to him and ask him to contact
me.
the memory boards (daughter boards) on the processor
card are (i think)
500K Words each, yes i said words...
the A series uses a 48 bit user word with a 4 bit tag (52 bit words)
the a7-811 processor had a second card strapped to the proccessor that
would allow a max of about 3-4 Mg Words.
The long net card is really the mainframe network interface, 10B2 or
AUI, in the right os it will support tcp/ip
There should also be a long scsi card, i believe a 1744 or there
abouts.. this would be the primary mainframe bus.
As far as I can tell, there is no card like this, and it does not appear to
be missing - I am wondering if this system is "a bit different". Here is
a more details description of what I have:
- There is a "map" printed on the side cover which shows the locations
of various items on the mainboard. It makes no mention of a SCSI
card. There is SCSI connectors, termination and other evidence of
a strong SCSI presence on the mainboard itself.
- The mainboard has 8 EISA slots.
The network card is plugged into the bottom slot (#1 on map).
The suspected A-Series card (with the "do not press" chip) is
plugged into the third slot from the top (#6 on map).
- The above are the only EISA cards - there are no missing end
plates or other evidence that a card has been removed.
- There is a daughter card attached to the suspected A-Series
card which contains memory SIMs.
- Above the EISA slots, toward the front of the machine, is the
486 CPU daughter card (Marked CPU module on the map).
Behind that (toward rear of machine) is a connecter marked
"CPU 64-bit connector" which is unconnected.
- Just above these two items (64-bit connector and 486) are
two slots marked "Memory module" which are both filled with
what is obviously memory cards.
the config error is usually due to:
a) a bad cmos battery
b) re-arranged cards
c) missing cards.
you need the SCU for the machine to fix the cmos to get rid of the error...
Unisys was very picky and nothing else would work
use the SCU for the unix box as the tags for the mainframe cards are wrong.
The same server cabinet also came with SYSVr4 Unix, be sure you DO NOT
I received no disks, documentation or other material with the machine.
I have obtained a ZIP archive of a number of config programs related to
this machine - Is there any way to identify the correct one of a particular
configuration/type of machine.
I can send a directory listing of the files that I have if that would help.
you should be able to boot from either the CD-rom or
the QIC tape. you
usually cannot boot from the floppy.
It "appears to try" to boot from floppy - if sucks on the disk for a few
seconds before it "dies" (no further activity - need power-cycle to
get back to activity).
Will it boot a "normal" CD? Ie: If I make a bootable CD with DOS
on it (done by a floppy disk image) - should this boot?
once you boot into os/2 (if it's there)
you'll get into the a-series maintenance mode support and the into the
a-series.
be sure that you DO NOT use a ps/2 style mouse as that interrupt is
needed for the mainframe.
once booted, the mainframe will try to boot from it's own boot drive.
the a series boot scsi disks are NOT 512 byte sectors, they are 180 byte
sectors and will not look right to any pc software. there is special
firmware on the drive to enable the correct size sectors, etc.
also, if you have 4mm or 8mm drives for it, they have custom firmware.
once booted, you should be able to get to an ODT screen,
enter ??MARC
if that is taken, about 3-4 minutes later you should see a login
screen.!!!! if so, we can talk from there.
MCP is the master control program and runs the a series line.
I have an A7-811 here and i think it still runs.
Thanks for all the info - I haven't gotten it to go far enough to
worry too much about "what happens after booting" yet, but this
is good to know - hopefully I will need this info shortly!
Regards,
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools:
www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html