I'm finding conflicting web docs about what algorithms pkzip prior to 2.0 (deflate == gzip) used. There were "shrink" and "implode", they had some run-length en

I'm finding conflicting web docs about what algorithms pkzip prior to 2.0 (deflate == gzip) used. There were "shrink" and "implode", they had some run-length encoding, and some entropy coding (shannon fano trees, later replaced by huffman coding in deflate). My vague memory says there was an LZW among them, with PKZIP 0.8 or something, but I'm not sure. What I am sure about, is that the predecessor to PKZIP, "PKARC", most certainly did use LZW; It was compatible with SEA ARC, but much, much faster (like 5x or so). SEA sued Phil Katz, and his response was to drop ARC compatibility and release PKZIP which was faster and better -- though the incumbent "deflate" method did not appear until version 2 a few years later.