 In late 1991, as the higher-end Macintosh desktop lineup transitioned to the '040, Apple was unable to offer the newer processor in their top-of-the-line PowerBooks until early 1994.With PowerBooks being restricted to 68030s for several years, "Macworld" reviewers conceded that the best choice for power users was the PC-compatible Texas Instruments 80486 notebook, rather than the top-of-the-line PowerBook 180.Versions of the 68040 were created for specific market segments, including the 68LC040, which removed the FPU, and the 68EC040, which removed both the FPU and MMU.