from
The Free On-line Dictionary of Computing (8 July 2008)
Motorola 68050
68050
There was no 68050. The successor to the {Motorola 68040} was
the {Motorola 68060}.
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 {Motorola 68000} with some
minor enhancements and modifications to some user/superuser
instruction assignments. The {Motorola 68030} was a {Motorola
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.
(1995-11-29)