Yes or No?

[MNH]

Hello,

You can modify this:

<<
{ " " " " " " " " "CANCL" "OK" }
TMENU
DO -1 WAIT
UNTIL
{ 15.1 16.1 }
SWAP POS
IF DUP
THEN 1 -
1
ELSE 1420 .074 BEEP
END
END
0 MENU
>>

From The HP 48 Handbook by James Donnelly.

Regards,

Mark