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Saving the state of HP41 CL to PC
12-31-2017, 03:25 AM
Post: #19
RE: Saving the state of HP41 CL to PC
(12-28-2017 03:46 AM)PeterP Wrote:  [*]Which events/functions clear the RAM page at 0x800?
[*]Do I need to save the page 804 as well or does page 800 include all the modules loaded correctly when saved?
[*]The XPMM module from Angel provides the functions "YWALL" / "YRALL" to store everything into Flash 0x1FE and 0x1FF. While certainly not as easy to use as it requires Lib#4 and OSX and XPMM, I wanted to know if there are any other risks/objections to using this function?
[*]If these functions are not objectionable, would it be possible to add them to the YFNZ module so that one always has the ability to restore to a nice state from a ML condition and batteries out?

Thank you for your kind help!

I think that MEMORY LOST clears some 41C register information, but I've never
traced that sequence.

Saving page 804 will preserve the MMU programming.

Not all Flash devices have the segmented top block that make the YWALL easy to
use. If the top block is not segmented you'll end up erasing the entire block (pages
1F8 through 1FF). In addition, depending on the sequence, you may end up
inadvertently erasing 1FE when you attempt to write 1FF.

There is no room in YFNZ.
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Saving the state of HP41 CL to PC - PeterP - 12-27-2017, 11:30 PM
RE: Saving the state of HP41 CL to PC - Monte Dalrymple - 12-31-2017 03:25 AM

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