VCCC2023 Entry By Csabo

Author: Csabo/LOD
Category: Christmas Challenge
System: Commodore 16 and Plus/4
Language: Assembler
Len source code: 1700 bytes
Len exe file: 94 bytes
Len code only: 84 bytes
Instructions:
YAPE or Plus4Emu recommended, both can autostart the file. The PRG can also be written to a D64 and loaded/started from it.
Description:
The code writes the star characters directly into the character memory.
One 7x7 diamond can be drawn by indexing the characters from a single memory location.
The X loop runs 3 times, draws the diamonds next to one another.
The Y loop stops at $0F00 (bottom of the screen).
A bunch of "stupid" optimizations are added, all of these are commented in the code.
The nice, proper version of doing them is in the code commented out.
Comments:
Greetings to everyone still working on the old Commodore 8-bit platforms.