Huge Program Space on HP-12C Platinum

[Csaba Tizedes]

(06-07-2020 12:45 PM)Namir Wrote:  What happens if you edit ANY of these programs by adding or deleting one or more steps? Does the system renumber GTOs like in the HP-35S?

This is the major disadvantage of 12Cs. Of course you can edit your program - if you wrote the whole again. Of course all GTOs must to modify by hand. If you want to shorten the program, you can use PSE instead of full rewrite, but this will slows down the running, unfortunately no NOP operation (which is very useful if the program is not allocated automatically) or you can use natural commands (eg. roll up and roll down, 1 + 1 -, etc...). If you want to insert more lines you can use GTOs as described in the manual.

The above is really frustrating, but the greatest problem, the memory is not freed-up, if you not use it. I mean there is no physical end of the program. Eg. if you wrote a solver and your equation is too long, the registers automatically converted to program steps. When you overwrite your equation and the new equation is shorter, not required to convert registers to program steps, you can not bring back that register's memory space.

So this is same as on Voyager 1 and 2: Wrote the whole stuff as short as possible, as final as possible and push it into the limited memory, because during the mission there is very limited possibility to modify anything.

Csaba