30 Apr
2009
30 Apr
'09
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