oh that's a miserable environment. i remember discovering that the label search starts from the beginning of your program text each time you branch (there's no table of label positions) so branching is much slower in later parts of your code.

the ti-81 was somehow worse. the If conditional only had the implicit else form (no Then/Else/End), there were no looping constructs (just Lbl, Goto, DS< and IS>), you had two lists for array-like data, and i can't recall ever figuring out how to manipulate strings—it may not have been possible.