HP-71b ROM version

[rprosperi]

I can extend some of those ranges a bit:

1BBBB: 2401Axxxxx to 2713Axxxxx (backs w/o screws, or V2, start around 2646Axxxxx)
2CCCC: 2718Axxxxx to 2745Axxxxx
2CDCC: 2810Axxxxx an up

And if anyone else has a machine that further extends and clarifies the date ranges, please post an update (here or elsewhere).

The most interesting week was 2401A, in which there were both 1AAAA and 1BBBB machines produced.

Edit: Corrected 1st char of later VER$