Greeting HP-28 Netlanders- First the question: Does anyone have information on interfacing the Printer port on the 28 to an IBM / RS-232 port? Second, the program: The following program solves the "Towers of Hanoii" problem. The 'Towers program goes something like this: you have three pegs with N disks on the first one. The object is to move all N disks onto the 3rd peg with-out placing a larger disk on a smaller one. MOVE << -> N F T A << IF N 1 == THEN "MOVE 1 FR " F ->STR + " TO " + T ->STR + PR1 1 DISP ELSE N 1 - F A T MOVE "MOVE " N ->STR + " FR " + F ->STR + " TO " + T ->STR + PR1 1 DISP N 1 - A T F MOVE END >> >> A couple of comments: Those with out a printer might want to delete the PR1 in the program. This will cut down on battery useage, and speed it up (although probably isn't needed here if you actually have the disks sitting in front of you...). Also, the output gets long quite fast (11 disks yeilds about a foot of thermal paper.) Hope you have fun with this! -mw- "Bad Karma is everyone's problem." Mrtoba