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64 lines
1.6 KiB
Plaintext
64 lines
1.6 KiB
Plaintext
Fun fact:
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The letter 'Z' does not appear at all in the lyrics to the song.
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(Noticed when I had to edge comparison for uppercase off by one)
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Challenges:
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+ 6-channel audio
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+ Fitting it all in 48k (want to avoid disk routines if can)
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+ Printing the ASCII art simple code (takes longer than 50Hz)
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ASCII Art Size
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The ASCII art is roughly 7k.
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You can LZ4 compress it and decompress on the fly, saving 3k or
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so even when factoring in the decompression code.
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The problem is decompression is slower (pauses the music) and
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can't be run at the same time as the music decompression is
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happening unless we duplicate a lot of code.
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May revisit if we need the room.
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Goal: Binary fits in 16k (16384 bytes)
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note size (bytes)
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--------------------- ------
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initial music player: 2078
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add raw ascii art: 9142
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add 3-channel music+lyrics,then slim a bit: 18787
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initial 40 col support: 18864
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have art loading properly 40col: 18910
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lz4 encode the ascii art: 15529
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revert because lz4 code not re-entrant: 18910
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add 4-channel music (KR4): 20128
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add cursor (a bit distracting) 20162
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feature complete 40 col: 20180
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intial 80 col support: 20191
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80 col cursor: 20344
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strip out some unneeded text printing: 19962
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Memory Map
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0000: Zero Page
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0100: Stack
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0400: Text Page 0 (AUX 0400: 80 column text)
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2000: HGR Page0
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4000: HGP Page1
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9600: DOS 37.5k
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C000: I/O Space
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D000: ROM
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FFFF: END
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Code: c00 - 8c00 32k
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(8k=audio, 5k=lyrics, 3k=art)
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Sound buffers: 5e00-9600 = 14k
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Plan:
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16k compressed Load at 32k? 8000
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20k decompressed Decompress from 0c00 - 6000 or so
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