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Motorola 68040
Motorola processor which existed around the same time as the Intel 486. The 68040 was used in Macintosh models such as the "Quadra" line along with the Amiga 4000. A lower cost version without the FPU exists as the Motorola 68LC040.
The MC68040 microprocessor is the most powerful member of the 68000 family, with performance approximately three times that of an MC68030 with the same clock speed. While the MC68040 is upwardly compatible with application software written for the MC68020 and MC68030, it also has many new features that contribute to its increased processing power. The new features of the MC68040 include
- a redesigned and optimized integer unit
- a built-in floating-point unit (FPU)
- built-in memory management units (MMUs), one for instructions and one for data
- built-in instruction and data caches, 4 KB each
The MC68040 is different in many ways from the MC68020 and MC68030. For example, the MC68040’s built-in FPU is not the same as the MC68881 FPU; similarly, the built-in MMU is not the same as the MC68851 MMU or the built-in MMU in the MC68030. Also, the instruction and data caches in the MC68040 use a new mode called CopyBack mode.