4K HP 67 Games rom attached for testing

[Gene]

Good point on the R routine. Let's go with your PI ^ 3 approach, but RCL + (recall arithmetic) does not work on an HP 41c, cv, or cx, as you say. To preserve the stack, what about this (or something such)?

LBL R
PI
ST+ 00
RDN
RCL 00
X^2
ST* L
X<> L
FRC
STO 00
END

On the 2636 game, let's leave it with the 130 RN's as it was intended. Emulators run it just fine and the 41CL runs it fine at 50X.