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91 lines
2.5 KiB
Plaintext
91 lines
2.5 KiB
Plaintext
Another / Out-of-This World Demake for Apple II+
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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by Vince "Deater" Weaver (vince@deater.net)
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http://www.deater.net/weave/vmwprod/ootw/
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Disk and LZ4 routines by qkumba
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+ The game "Another World" was released in 1991.
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Written by Eric Chahi.
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It was eventually ported to many systems (I played it on IBM PC).
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It even got an Apple IIgs port (the IIgs is 16-bit with fancy
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graphics and sound). However you couldn't play it on
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earlier Apple II systems... until now.
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+ I was inspired to do this by this amazing PICO-8 version of:
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https://liquidream.itch.io/another-world-survival
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and thought the Apple II lo-res palette (15 colors, 40x48 graphics)
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might be just barely enough to do it justice.
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==================
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Game controls:
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==================
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Use WASD keys to move, also arrow keys where available.
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This is tricky as the original Apple II keyboard is very
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simplistic so it's hard to get auto-repeat or multi keypress.
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Spacebar is action.
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During the intro, you can press R to make it repeat forever.
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Joystick support: none yet?
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==================
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Development notes:
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==================
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Memory map:
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00 zero page
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01 stack
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02 ????
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03 nibble table/disk data
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04-07 GR page0
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08-0b GR page1
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0c-0f offscreen data ($c00 = disk load buffer)
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10-13 offscreen data2
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14-16 loader
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17-89 program/compressed-data (30.25k)
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90-bf currently decompressed level data (12k)
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c0-cf I/O
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d0-ff ROM
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Memory squeeze!
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10,748 over all graphics in
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10,734 over remove extraneous blank bg image
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8,658 over re-arrange memory map, 42k avail now
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8,562 over move gr_make_quake out of common code
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8,374 over remove extraneous code (mostly put_sprite_flipped)
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5,469 over allow changing bg on fly in sequence
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4,122 over modify cyan frames to be on fly
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2,749 over do same for zappo routines
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2,493 over squish disk loader vars to page 3
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2,165 over horrible hack to auto-go to next image in sequence
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2,114 over move bg loading into seq
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2,053 over make elevator indicator a loop
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1,347 over use LZ4 instead of RLE
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Gave up, see if we can compress in chunks and decompress, sort of like
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my chiptune player does.
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Let's take a 12k region of memory = $3000
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$C000 - $3000 = starting at $9000
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ID1 = 1461 2143\
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ID2 = 1759 2687|--- together in 01
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ID3 = 1195 1879/
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ID4 = 2514 8280\--- in 04
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ID5 = 1947 3492/
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ID6 = 2584 3610\ --- in 06
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ID7 = 2834 3606/
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ID8 = 3705 4918 | -- in 08
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ID9 = 4494 5901\ -- in 09
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ID10 = 3397 5558/
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===== ======
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25890 12k
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