Alto II Display Control circuit board
On component side there is a two-position manual switch labeled "EXT/INT".
Xerox PARC (Palo Alto Research Center)
||Ink stamped on wiring side
||Silk screened on component side
||Labeled as "PWB NO." This number is silk screened on component side
||Labeled as "ASSY NO." The numbers are silk screened and the "E" is ink stamped
overall: 1/2 in x 11 in x 7 3/8 in