Saving the state of HP41 CL to PC

[Monte Dalrymple]

(12-29-2017 06:11 PM)PeterP Wrote:  Waiting for @Monte to tell us about the V5 board behavior regarding sector 1F8 as per @Angel's comment. I was naively assuming upward compatibility (what works on V3 works on V5) which shows my ignorance when it comes to hardware. He probably also put it in the manual and I just cant find it / understand it...

The memory organization is explained in the Update Functions Manual. But
the top block is different with different Flash sizes. Plus, not all Flash devices
segment the top block. My original intent was to only use bottom-block
segmented devices, because that is where the OS resides, and would make
updating the OS a little more safe. But availability issues forced me to use
whatever was available when I had a batch fabricated. So some batches
had the bottom block segmented and some had the top block segmented.

So, to answer your question, on a V5 board the 1F8 segment is just another
block of Flash. I think that the best solution to this backup issue would be
to allow the functions specify which Flash pages to use, rather than picking
a specific page.