HP 71B Diagnostic ROM

[Joe Horn]

(04-13-2014 01:24 AM)Raymond Del Tondo Wrote:  I'm sure the HP-71B with datecode 2515 either has transplanted innards from a later unit, or at least the back side has been replaced.
I have seen HP-71B units from 1987 with ROM 1BBBB, and the update to ROM 2CCCC happened in 1987, and shortly after the first upgrade the ROM 2CDCC was released.

Cool, I've got a '71B Frankencalc: Date code 2412, VER$ 2CDCC, metal back.