CPU INFO Versions are provided for the 68000/68010, the 68020/68030, and the 68040/68060, and are named LZX_68000EC, LZX_68020, and LZX_68040, respectively. In addition, only the 68000/68010 version supports AmigaDOS 1.3; the 68020/68030 and 68040/68060 versions do not. Users with a 68000 or 68010 CPU can run only the 68000/68010 version, while users with a 68020-68060 CPU can run any version if they have AmigaDOS Release 2 or later. LZX has been carefully hand-crafted for each CPU; performance will be degraded somewhat if running a version not optimised for your CPU. Unlike most programs which provide CPU depdendent versions, LZX was designed around the instruction set of the 68020-68060, which required that the 68000/68010 version be specially written to use only 68000/68010 instructions. The 68000/68010 version has all of the functionality of the other versions, but receives the "EC" (economy) designation to identify it as being somewhat different internally. The 68000/68010 version runs a little more slowly than the other versions, but not much more slowly.