30 Apr
2009
30 Apr
'09
1:56 p.m.
Can anyone identify these boards?
http://sturgeon.css.psu.edu/~mloewen/DSC01381.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01382.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01463.JPG
They're stamped IBM, with etched numbers LBJ5360, LBJ5403 and LKJ12470.
The owner says they were given to him in 1978, and were supposedly from
North Bay, Ontario.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
30 Apr
30 Apr
3:11 p.m.
Mike L. wrote:
Can anyone identify these boards?
http://sturgeon.css.psu.edu/~mloewen/DSC01381.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01382.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01463.JPG
They're stamped IBM, with etched numbers LBJ5360, LBJ5403 and
LKJ12470.
The owner says they were given to him in 1978, and were supposedly
from
North Bay, Ontario.
I can't identify the application, but these probably aren't read/write
magnetic core memory.
Based on the way they are wired, they look more like ROS (Read Only
Storage, IBM's TLA for ROM).
Each board looks to be a 10 word by 10-bit ROM.
Can't say this definitively, but it's a semi-educated guess.
Rick Bensene
The Old Calculator Museum
http://oldcalculatormuseum.com
5:43 p.m.
--- On Thu, 4/30/09, Rick Bensene <rickb at bensene.com> wrote:
>
http://sturgeon.css.psu.edu/~mloewen/DSC01381.JPG
> http://sturgeon.css.psu.edu/~mloewen/DSC01382.JPG
> http://sturgeon.css.psu.edu/~mloewen/DSC01463.JPG
Based on the way they are wired, they look more like
ROS
(Read Only
Storage, IBM's TLA for ROM).
Each board looks to be a 10 word by 10-bit ROM.
My guess is that this is either a switch core matrix
(a magnetic decoder used to drive the X-Y select lines
of a core memory) or some other magnetic-logic device
such as decoder or shift register.
--Bill
6:09 p.m.
On 30 Apr 2009 at 12:11, Rick Bensene wrote:
I can't identify the application, but these
probably aren't read/write
magnetic core memory. Based on the way they are wired, they look more
like ROS (Read Only Storage, IBM's TLA for ROM). Each board looks to
be a 10 word by 10-bit ROM. Can't say this definitively, but it's a
semi-educated guess.
These look too large to be ROS. I'm with the other poster who
guessed that this might be a driver assembly--the multiple turns on
each core would seem to indicate that transformer action that
desired, not memory. If it wasn't IBM, I'dve guessed some sort of
core logic or parametron application, but AFAIK, IBM didn't use
those.
--Chuck
5:42 p.m.
Looks like very early JROM jumperable read only memory.
It is clearly 10x10 array with 10 selectable coils per core providing full 10 bit
programability.
IBM 700/7000 series used BDC (binary-coded decimal).
Beyond that I am only guessing ...
The other Bob
On Thu, 30 Apr 2009 13:56:20 -0400 (EDT), Mike Loewen wrote:
Can anyone identify these boards?
http://sturgeon.css.psu.edu/~mloewen/DSC01381.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01382.JPG
http://sturgeon.css.psu.edu/~mloewen/DSC01463.JPG
They're stamped IBM, with etched numbers
LBJ5360, LBJ5403 and LKJ12470.
The owner says they were given to him in 1978, and were supposedly from
North Bay, Ontario.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
5:49 p.m.
--- On Thu, 4/30/09, Bob Bradlee <caveguy at sbcglobal.net> wrote:
Looks like very early JROM jumperable read only
memory.
It is clearly 10x10 array with 10 selectable coils per core
providing full 10 bit programability.
That makes sense. I can't make out the wiring on the back
side at all (could we have a better picture?) but
that would explain all of those test points.
--Bill
5543
days inactive
5543
days old
5 comments
5 participants
participants (5)
-
caveguy＠sbcglobal.net -
cclist＠sydex.com -
mloewen＠cpumagic.scol.pa.us -
rickb＠bensene.com -
wmaddox＠pacbell.net