HP-41CY re-initialization ROM

[Raymond Del Tondo]

(11-22-2019 04:31 PM)Jurgen Keller Wrote:  I've also seen 32K RAMBOXes with OS/B from the 41CY. They run fine, although the bank switching functions (PG<>, PG01 and PG10) obviously don't have any effect.

Actually it's very likely those came from me in the one or other way;-)
It usually indicates a 32k RAM box was initialized using my CY-INIT ROM...
Since CY-INIT was meant to be used in real CY units with 64k,
there was no check whether the bank switch was successful.
It was the normal case in a CY, and thus the OS-A was written,
a bank switch was initialized, and OS-B was written afterwards.

There were plans (and notes in the src file) to add a suitable check,
but it was never implemented, although it's not too complicated.
Instead of it, I later made an RB-INIT ROM for 32k RAM boxes.
Of course the latter loaded the RAMBOX OS (mostly 2B, IIRC) to page 8...