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Mystery Logic Boards from 1968 or 1969
  by Bill Degnan - 01/03/2013 17:50
Pictured is a pair of computer logic boards from 1968 or 1969. The part numbers (?) printed on the boards are 438811-1 and 438803-1B. Can you identify the manufacturer of these boards? These boards are exactly 14 cm (not including the handles), they're larger than similar boards from Digital Equipment Corporation. The Click image for larger view.


ID labels RA 240-2 and DR 240 are silk-screened on the thumb handles. Click image for larger view.


Note the silk-screening on the two PD993659 chips. Philco is the manufacturer and the date codes are early 1968. Click image for larger view.


Here is a view of the six transistors found on the DR 210. The RA 240-2 has four similar transistors. Click image for larger view.


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