Xmas Star Mod 6

Author: Ervin / Abaddon
Category: Christmas Challenge
System:   C64
Language: BASIC V2
Len source code: 94
Len exe file:    91
Len code only:   89
Instructions:
Install vice, drag and drop the prg file into it
Description:
In a 19*19 grid (indxed as (0..18)*(0..18), upper left corner being (0,0)), locations where (((x+y) mod 6) == 3) or (((x-y) mod 6) == 3) should be stars (*), the rest is space.
Comments:
This is the way!