HP Portable Plus ... until 2039?

[Michael Fehlhammer]

Hello J-F,
you are right, that's a pity. But you can see it that way: 25 years left to rewrite the operating system!

While doing this there would be a good opportunity to upgrade from DOS 2.11 to 3.3 or, even better, to 5.0, thus opening a whole new world of software for the PP.
Another drawback of the PP is its lack of IBM compatibility due to its proprietary BIOS. I couldn't make any of the the programming environments like Turbo BASIC/C or Quick C run. Would a simulation of the PC-BIOS be imaginable? Or does typical PC software ( like the ones mentioned above ) circumvent not only DOS but also defined BIOS calls, addressing compatible PC - components directly?
In that case we would need an add-on board ...