Mystery Core

[Bob Bradlee]

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/