It looks like none of this actually works, but...

D$,RPNProbably just a coincidence, I mean, there's other stuff that looks like that and has other characters that appear to mean nothing.

D$ WRPN

RPN loopUm... what... (This is in what appears to be a list of commands with their associated English and French descriptions, and there's no actual associated command here, it seems (although I need to look closer.))

Boucle en mode RPN

rpn()Well then. (However, that command is taken as a syntax error.)

RPN mode (Reversed Polish Mode)

Mode RPN (saisie polonaise inverse)

T_STACK

T_RPN_END

T_RPN_BEGIN

T_RPN_OP

T_RPN_WHILE

T_RPN_IF

ROLL

ROLLD

SWAP

OVER

PICK

DROP

RPN_LOCAL

RPN_FOR

RPN_WHILE

RPN_CASE

RPN_UNTIL

rpn_prog

RPN_LOCAL

RPN_LOCAL must have at least 3 args

STEP

NEXT

START

Invalid_RPN_FOR

RPN_FOR must have at least 4 args

REPEAT

Invalid_RPN_WHILE

WHILE

RPN_WHILE must have at least 2 args

CASE

Invalid_RPN_CASE

RPN_CASE must have at least 1 arg

UNTIL

Invalid_RPN_UNTIL

RPN_UNTIL must have at least 2 args

RPN-specific looping constructs, as well as an RPN-specific local variable assignment? Very, very interesting.

**Edit:** Not as interesting as I thought. They just left Giac's rpn.cc in. (Funnily enough, they also left Giac's ti89.cc in. That's right, there's code for simulating TI-89 behavior in the 39gII, that's just sitting there doing nothing.)

*Edited: 11 May 2013, 1:52 p.m. *