Vintage Computing Christmas Challenge 2023 (VC³ 2023)

Author: Codey/2D
Category: Christmas Challenge
System:   C64
Language: Assembler
Len source code: 411
Len exe file:    75
Len code only:   61
Instructions:
Install vice, drag and drop the prg file into it
Description:
A single diamond is plotted at a given position - this is repeated 9x.
Comments:
Self-modifying code for row position.