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HP-41CY re-initialization ROM
11-03-2019, 12:10 PM (This post was last modified: 11-03-2019 02:25 PM by Jurgen Keller.)
Post: #6
RE: HP-41CY re-initialization ROM
I made an illustration of the problem. Maybe that helps to understand what I'm currently trying to avoid:

[Image: hp41cy_bsw_scenario1.png]

This picture inspired me and here is a sketch of the potential solution:

[Image: hp41cy_bsw_scenario2.png]

This looks adventurous to say the least! As you can see I propose to set the ENROM1 instruction at a page boundary and mask the next page with a ROM. Remember that ENROM1 only works when executed in RAM. Not sure if the HP-41 hardware allows for such page crossing MCODE. I'll give it a try anyway :-)
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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 - Jurgen Keller - 11-03-2019 12:10 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 - CY-CL - 12-27-2019, 07:32 PM



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