| • Science | • People | • Locations | • Timeline |
The even numbers ( 68000, 68020, 68060) were reserved for major revisions to the 680x0 core. The odd numbers ( 68010, 68030, 68050) were minor upgrades from the previous chip. For example, the Motorola 68010 was a 68000 with some minor enhancements and modifications to some user/superuser instruction assignments. The Motorola 68030 was a 68020 with an MMU and more minor enhancements. The 68050 would have been a 68040 with some bugs fixed, which didn't really warrant a new name so it was sold as a 68040.
This article was originally based on material from the Free On-line Dictionary of Computing, which is used under the GFDL.