Apple Chip Service Part Numbers: Trivial Discrepancies

Quite often customers discover discrepancies in packing lists and actual parts received, most recently with the Apple IIe ROM Enhancement Kit. The story behind this problem also applies to ALL other Apple Chip part numbers, often called the service part number.
If (and only if) there are two chips:

1. when the four final digits of the part numbers are identical

and

2. when the the first three digits of the part numbers are 341 and 342,

then the chip with part number beginning with 342 has been burnt-in and the other has not.

Note: Do not infer that all chips with part numbers beginning with 342 have been burnt-in.
Published Date: Feb 19, 2012