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HP-41CY re-initialization ROM
11-22-2019, 07:24 PM
Post: #35
RE: HP-41CY re-initialization ROM
(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...

-- Ray
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Messages In This Thread
RE: HP-41CY re-initialization ROM - PeterP - 11-03-2019, 06:19 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-04-2019, 03:48 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-06-2019, 03:36 PM
RE: HP-41CY re-initialization ROM - CY-CL - 10-27-2019, 04:16 PM
RE: HP-41CY re-initialization ROM - hth - 11-03-2019, 05:59 PM
RE: HP-41CY re-initialization ROM - hth - 11-03-2019, 08:32 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-06-2019, 03:39 PM
RE: HP-41CY re-initialization ROM - hth - 11-06-2019, 07:45 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-06-2019, 07:45 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-09-2019, 08:21 PM
RE: HP-41CY re-initialization ROM - PeterP - 11-09-2019, 08:19 PM
RE: HP-41CY re-initialization ROM - Raymond Del Tondo - 11-22-2019 07:24 PM
RE: HP-41CY re-initialization ROM - CY-CL - 12-27-2019, 07:32 PM



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