VC³ 2023 'The Starry Night of Christmas'

Author:   Erik Hooijmeijer / ctrl-alt-dev.nl
Category: Christmas Challenge
System:   Unexpanded VIC-20
Language: Assembler, homegrown
Len source code: 1209
Len exe file:    95
Len code only:   77
Instructions: 
     Install vice, start the VIC-20 emulator, drag and drop the prg file into it
Description: 
     Prints the pattern using the formula ((x % 6 == y % 6) || ((x + y) % 6 == 0))
     Uses standard kernal routines to render the output.
     Mod 6 is calculated by substracting 6 repeatedly.