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