Motorola 68012 (MC68012) is a
68010-compatible microprocessor with
large memory support. The width of 68012 address bus was increased to
31 bits, this allows the CPU to address up to 2 GB of physical memory.
All other features of the 68012 microprocessor - virtual memory
support, 16-bit data bus, instruction set - are the same as for the 68010 CPU.
The 68012 is not pin-compatible with the 68010 microprocessor.
The MC68010 was produced in 68-pin PGA package, and MC68012 is housed
in 84-pin PGA package. Larger pin-count for the 68012 package
was necessary to accommodate six additional address bus signals.
The MC68012 was used as an interactive processor in Alliant FX/8
computers. One FX/8 computer could have up to 12 68012
microprocessors.
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