newRPL - Updated to build 1510 [official build remains at 1487]

[Claudio L.]

(11-27-2023 12:24 PM)Klaus Wrote:  I had to reinstall the stock ROM on my HP50 after using the NewRPL ROM for a long time. After the installation, I discovered that the HOME directory with all user files, all the libraries I had installed, and all the special settings of the computer were there as originally --- as if by magic. How is that possible? I always thought that when the NewRPL operating system was installed on the HP50, all memory would be rewritten, meaning everything would be deleted. Can someone explain this to me -- would be very grateful!
Greetings Klaus

The 50g stores Port0 and your HOME directory in the higher portions of your Ram. The "lower" parts here means the bottom of the 512k. The first 128kb are used by the Kinpo OS and the Saturn emulator, the second 128k are used for Port1 if I remember correctly, and only then the user visible memory starts. First system variables and then TempOb, and above that the stack. All of that memory so fart can be lost without any consequence. Above the stack is your Home directory and above that Port0.
NewRPL takes 4k pages and assigns it to different areas as needed, but starts taking memory from the bottom so if you used your calc lightly it is entirely possible that you never needed to use the higher portions of ram, and your data stayed there untouched. The TTRM prompt will aggressively try to recover your Home directory so don't be too surprised that it found it.