42s - That other 28pin footprint?

[Didier Lachieze]

(09-03-2016 08:34 PM)TomC Wrote:  Any speculation what this was intended for? Can it be utilized now?

The second 28-pin footprint was used for a second ROM in the HP-17B/BII international versions which contain different languages in addition to english.

See the discussion starting with message #7 here for details about using this slot in the 42s.