| (processor) | Motorola 68010 - A microprocessor from Motorola. It was the
successor to the Motorola 68000 and was followed by the
Motorola 68020. Some instructions which were previously
user mode were made system mode, which necessitated
patches to a few programs.
The 68010's main advantage over the 68000 was that it could
recover from a bus fault. The 68000 microcode didn't save
enough state to restart all instructions; the 68010 corrected
this fault. This allowed it to use paged virtual memory.
The 68010's DBxx (decrement and branch) instructions could
hold and execute the preceding instruction in the prefetch buffer, allowing some two-instruction loops to execute
without refetching instructions.
At one time there was a 68010 variant that was pin-for-pin
compatible with the 68000. Early Amiga hackers replaced
their 68000s with 68010s in order to get a small performance
increase. | |