In this thread in the French MySilicium forum there are several programs to display the Fibonacci sequence as a binary image. The original idea is from this page: http://naivedesign.com/ND1/The_Fib_Triangle.html.

The by far fastest solution runs on a HP50g and uses binary arithmetic and a dynamically built GROB. The HP40gs uses very similar hardware but its programming model is so simplified that I came up with a program which is about 100 times slower than the user RPL program for the 50G. This is a little frustrating. The main problem is that I couldn't find a way to dynamically construct a GROB. I see two possible solutions:

1) There exists a library somewhere in the wild which provides dynamic string and GROB handling.

2) The program is translated to SysRPL. Can I program in SysRPL on the machine or what do I need?