HP48

[David22]

(10-14-2020 04:37 AM)jklsadf Wrote:  Not quite the same, but the HP 48G series has an undo function (right-shift EVAL), and the HP 48S series has a last stack function (left-shift 2).

The similar (not equal¹) function to LAST-X in RPN is LASTARG in RPL (HP 48 series).

UNDO/LAST_STACK is totally different idea: it restores stack to previous state before operation, and old HP RPN machine doesn't have that functionality (only RPL have those capability).

¹: LAST-X in RPN and LASTARG in RPL get the same reults if RPL operation only gets one argument. If las operation takes more than one argument, LASTARG returns all them, while LAST-X only returns X (top stack element for that prior operation).