Alto II disk control circuit board
Xerox PARC (Palo Alto Research Center)
||Ink stamped on wiring side. The rest of the number is illegible
||Silk screen on component side.
||Labeled as "PWB NO." This number is silk screened on component side
||Labeled as "ASSY NO."
overall: 1/2 in x 11 in x 7 3/8 in
There hand engineering changes on wiring side.