(HP71B) ASM question

[rprosperi]

(07-23-2024 05:54 PM)floppy Wrote:  It was not easy peasy to read the IDS...

This is the understatement of the month!! Although reading foreign code, and especially for an unknown assembly language, can be time-consuming, difficult and frustrating, I have found the 71B IDS to be even harder than most on the several attempts I made in the past. No doubt mostly because I never knew the NUT instruction family, but also because I had only used 6800 and PDP-11 assembly languages at the time, and the HP NUT and Saturn could not be more different. The tight code space, layered use of 'library' calls, wacky different sizes of registers and nibble orientation also all contributed to a series of aborted attempts to gain any general understanding. Good for you floppy for sticking with it to make enough progress here, well done!