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Author Topic: How does the Lisa's icon-compression algorithm work?  (Read 12 times)

AlexTheCat123

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In the Lisa Hardware Manual, it says that expansion card icons can be stored in a compressed format if the MSB of the icon count byte is set. And it also states that "a special program is currently available to do the compression", but I'm guessing that program has probably been lost to time. Does anybody know how this compression algorithm works and how the compressed icons are stored? After compression, are all icons the same length in ROM or or does the length of the icon vary based on the efficiency of the compression on that particular icon?
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