Prime v1.2
by Andrew Gacek
andrew@dgi.net

This program tells wether a number is prime or what it is divisible by.
v1.2 is now faster, smaller, and the source is commented.
Also in v1.2 the program loops at the end.  After checking one number you can move on to another from there.

Use the arrows keys to enter the number.
Up goes up one
Down goes down one
Right goes up one hundered
Left goes down one hundered
Enter checks the number
Mode exits to ASH

The program is now 185 bytes and it can check numbers up to 65535 (max 16bit register value).
To test the speed, input 65521 (The largest prime under 65535).
I clocked it at about 3.25 seconds.

*Note*
This program says that 1 is prime and that 0 and divisible by 2... Live with it!