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What is the difference between the old and new E1406A?

E1406A products manufactured before May 2002 and with serial numbers lower than US41000101 were thru hole boards. Two boards were present and consisted of a main PCA, E1406-66501, plus a memory PCA which was either the E1406-66502 standard memory board or the E1406-66503 option 010 max memory board.

E1406A products with serial numbers greater than US41000101 contain only one board, E1406-66511. This is a surface mount board with maximum memory.