Name that calculator - from the program listing...

[Sylvain Cote]

Another jewel from Ángel the magician!
HP-41 of course!
I would assume CL is not mandatory for this one, using alpha to hold enter/exit condition is brilliant.

• DO ... "condition" WHILE
• "condition" IF ... THEN ... ENDIF
  

Some questions ...

• did you also include the loop : "condition" WHILE ... WEND ?
• will it it support a control decision/loop inside another control decision/loop ?
  

Sylvain