tobinary.bas

Chipmunk basic for OS X can be downloaded here: http://www.nicholson.com/rhn/basic/#3

The algorithm for binary conversion is a simple one, as described here: http://trunix.org/programlama/cpp/fred/notes/cpp/misc/decimal2binary.html

10 INPUT num 
20 WHILE num > 0
30   m = num mod 2
40   out$ = str$(m) + out$
50   num = int(num/2)
60 WEND
70 PRINT out$

Chipmunk seems to have a built-in command for binary conversion:

10 INPUT MYNUM
20 PRINT bin$(MYNUM)

It provides a reference in the README file: 

http://www.nicholson.com/rhn/basic/basic.man.html


Hope this helps.