19 Mar
2008
19 Mar
'08
2:31 p.m.
I have a working Data I/O 29B with a 128K RAM module which only had
half of the DRAM sockets populated. From looking at the schematic, it
seemed that by simply populating the remaining DRAM sockets that I
would bring the module up to the full 128K. I tried that, but the 29B
still only reports 64K of RAM. What did I miss?
-Mardy
19 Mar
19 Mar
3:26 p.m.
I have a working Data I/O 29B with a 128K RAM module
which only had
half of the DRAM sockets populated. From looking at the schematic, it
seemed that by simply populating the remaining DRAM sockets that I
would bring the module up to the full 128K. I tried that, but the 29B
still only reports 64K of RAM. What did I miss?
One of the manuals that I have says that the expansion board provides up
to 64K of memory, and that "future expansion" will allow up to 128k of
memory.
Later on, it says: "64K or 128K (future) configuration is selected by
the programming of PAL, U22". So this could be one issue.
It could also be firmware related - you probably want to have the latest
firmware installed (IIRC 6?). Later versions of the 29B supported up to
256K of RAM.
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html
3:31 p.m.
What's the difference between the 29A and 29B?
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
4:05 p.m.
On Mar 19, 2008, at 3:26 PM, Dave Dunfield wrote:
U22 is the address
decode logic, so that makes sense. Changing it is
an altogether different problem though.
I have a
working Data I/O 29B with a 128K RAM module which only had
half of the DRAM sockets populated. From looking at the schematic,
it
seemed that by simply populating the remaining DRAM sockets that I
would bring the module up to the full 128K. I tried that, but the
29B
still only reports 64K of RAM. What did I miss?
One of the manuals that I have says that the expansion board
provides up
to 64K of memory, and that "future expansion" will allow up to 128k of
memory.
Later on, it says: "64K or 128K (future) configuration is selected by
the programming of PAL, U22". So this could be one issue.
It could also be firmware related - you probably want to have the
latest
firmware installed (IIRC 6?). Later versions of the 29B supported up
to
256K of RAM.
Are upgraded firmware images available anywhere?
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools:
www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html
4:07 p.m.
New subject: Autonetics D37 ?
I picked up what I believe is a console from an Autonetics model D-37 Minuteman I missile
guidance computer. There's a little info
on the web about the computer but nothing that shows the console.
I assume the console was just used for testing on the ground or possibly it was used in
the computer's development. Could even be unrelated to the D37 guidance system. Does
anyone recognize it, or have any stories?
http://www.dvq.com/oldcomp/photos2/1k/d37_1.JPG
Thanks,
Bob
5:11 p.m.
New subject: Autonetics D37 ?
--- Bob Rosenbloom <bobalan at sbcglobal.net> wrote:
I picked up what I believe is a console from an
Autonetics model D-37
Minuteman I missile guidance computer. There's a little info
on the web about the computer but nothing that shows the console.
It certainly looks plausible that it is a console for a disk-memory
computer.
I assume the console was just used for testing on the
ground or possibly it
was used in the computer's development.
That would be my guess. Where did it come from? Any chance of getting the
D-37 itself? Apparently, when the original guidance system was upgraded
in the 1960s, some old Minuteman I CPUs were donated to universities.
--Bill
6:02 p.m.
New subject: Autonetics D37 ?
William Maddox <wmaddox at pacbell.net> wrote:It certainly looks plausible that it
is a console for a disk-memory
computer.
I assume the console was just used for testing on the
ground or possibly it
was used in the computer's development.
That would be my guess. Where did it come from? Any chance of getting the
D-37 itself? Apparently, when the original guidance system was upgraded
in the 1960s, some old Minuteman I CPUs were donated to universities.
--Bill
It came from one of the Government Liquidation auctions. It just looked interesting so I
bought it. It required an EUC! Crazy for a system from the 1960's. No hint of the rest
of the computer that I can find on the site, but I'm still looking (their search
engine sucks). I would love to find the disc memory.
Bob
3:47 p.m.
Marden P. Marshall wrote:
I have a working Data I/O 29B with a 128K RAM module
which only had half
of the DRAM sockets populated. From looking at the schematic, it seemed
that by simply populating the remaining DRAM sockets that I would bring
the module up to the full 128K. I tried that, but the 29B still only
reports 64K of RAM. What did I miss?
I don't have the links on hand, but there's a hack to bring it up to
either 256KB or 1MB; I disremember which.
I do remember that the resistors on the memory board need to be moved
to ID the new DRAMs.
Ah, here is the old link:
http://www.leopardcats.com/dio/upgrade.htm
And I did happen to have that archived. So:
http://www.mdrconsult.com/~doc/upgrade.htm
Not mine, and I haven't had time to try it, so yer on yer own! And
if the creator of that page is on the list, I can leave it up or take it
down as you wish.
Doc
5969
days inactive
5969
days old
7 comments
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participants (6)
-
bobalan＠sbcglobal.net -
dave06a＠dunfield.com -
doc＠mdrconsult.com -
mardy＠voysys.com -
mloewen＠cpumagic.scol.pa.us -
wmaddox＠pacbell.net