RPN programming model survey

[Gene]

(01-15-2023 02:45 AM)Joe Horn Wrote:  The 35s might be unique in that it not only allows "GTO LBL+line number" programming, but also has the "feature" of automatically renumbering all the line numbers after GTO's when program lines are inserted or deleted. That sounds nice, but it's actually a horrible idea, because if GTO Znnn is in the program, and you delete program line Znnn, the GTO now points to the wrong line (namely, what had been the line after Znnn before the edit). Every time I try to debug by trial and error on the 35s, the GTO's get all out of whack. Horrible idea.

Gene: As far as I know, EVERY programmable model (TI or HP) that uses GTO line numbers (Znnn) will point to the wrong line once you delete line Znnn.

001 LBL A
002 GTO 003
003 SIN
004 COS

On ANY model SR-52, SR-56, TI-58, HP-25, if you delete line 003 SIN, line 04 will now become line 003 COS which is now what you originally intended.

I know the checksum is an awful bug, but if you program with line number GTO instructions, life is tough.

And I am open to being shown a model where the above 4 step program will work properly if line 003 is deleted.

The 35s "locks" in a destination "instruction" with the GTO line number and if the step number changes, the instruction is still pointed to.

Yes, that can be a pain, but the alternative is IMO worse.

I say that as an SR-52 programmer. Absolute GTO is a very mixed bag.

:-)

Gene