Apple II Seasons 128B Demo
-=DESiRE=- / Outline 2020
Watch as leaves cycle through the colors of the seasons
Platform: Apple II
Requires Apple II+ (1979) or later
Code: deater
hellmood
qkumba
Link to video:
http://web.eece.maine.edu/~vweaver/junk/appleii_seasons.mkv
Video captured on AppleWin emulator. Should run on real
hardware but all of my Apple II hardware is on lockdown at work.
Files:
SEASONS -- 127 byte executable
seasons.s -- source code, can assemble with ca65 assembler
seasons.dsk -- 140k Apple DOS33 disk image suitable for use in emulator
Notes:
+ 128 Byte demo for the Apple II (1MHz 6502)
+ Written in 6502 assembly language
+ Uses "high-resolution" graphics mode which is 280x192 in 6 colors.
This mode has lots of complex color-clash and memory-interleave
issues which make it a pain to code for.
+ The Apple II has very simple graphics. No hardware sprites, no
VBLANK/HBLANK interrupts, no scrolling, no palette
changes, no acceleration of any type. The only feature
it has is two graphics pages
for page flipping (which is not used in this demo)
+ Depends on the Applesoft BASIC ROM for "HPLOT" routine
which means it requires at least an Apple II+ (released in
1979) or later machine.
Should work on a II+/IIe/IIc/IIgs, and even an original
Apple II (1977) if you have an Applesoft language card
ROM expansion
+ Based on Hellmood's 64B DOS demo "Autumn"
+ Saves a few bytes by running entirely in the zero page
6c7139300b