There was no Motorola 68070. The 68060 was the last development of the 680x0 series for general purpose use, abandoned in favour of the PowerPC chips. It saw use in some late-model Amiga machines, but Apple Computer and the Unix world had moved onto various RISC platforms. If there had been a development of the 060 it would have been the 070.
The even numbers (68000, 68020, 68060) were reserved for major revisions to the 680x0 core. The odd numbers (68010, 68030, 68050, 68070) 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 68070 would have been a 68060 with some bugs fixed. By that time, Motorola had abandoned development on the MC68k chips in favour of PowerPC
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