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Motorola 68030
In 1987, Motorola introduced the 68030. This chip was not much faster than the 68020, but offered design innovations, such as a built-in Paged-Memory Management Unit (PMMU) that provided support for System 7’s virtual memory. Apple incorporated the 68030 into its second generation Macintosh II line of computers: The Macintosh IIx, IIcx, IIci, IIvi, IIvx, Performa 400 and 600, and SE/30, as well as most of the first generation PowerBooks (the 145, 170, 180, and so forth).
One notable change between this processor and the Motorola 68020 processor is the addition of an MMU allowing the 68030 to work with virtual memory. The 68030 was used in a number of Apple Computer systems along with Amiga, Sun, NeXT.
The 68030 added a 256-byte data cache to the existing instruction cache to hold the most recently used data which can be sent to the CPU without calling on RAM or disk.
The 68030 introduced a parallel bus design, called the Harvard-style bus architecture, that consisted of two 32-bit address and data buses. The address and data buses operate in parallel, letting the CPU perform multiple tasks simultaneously. Using this bus design, the CPU can simultaneously access its data and instruction caches, as well as external memory simultaneously.
Replaced by the Motorola 68040 and Motorola 68LC040 (without the FPU).