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.