Hi HP-71B fans!
I updated my page about versions and bugs of the HP-71B, especially regarding version 1AAAA. I found a lot of informations in the HP IDS (Internal Design Specification) for version 1BBBB. Actually, I didn't review the 3000 pages, but I made a binary comparison between the 1AAAA and 1BBBB ROM. Each time I found a difference, I checked the corresponding IDS pages and very often comments explained the reason of the change.
I don't have the IDS for version 2CCCC (it exists, let me know if you have it!), and I was not able up to now to make the same study for 1BBBB-2CCCC differences. However, I checked the fixes of some 1BBBB bugs, and give a description of an interesting bug, still in 2CDCC ROM, related to "funny functions" (Math FNROOT, INTEGRATE for instance) and user-defined functions.
Many thanks to Gordon Dyer, for the lending of his 1AAAA machine some times ago.
J-F