The Core
General
The Pentium® II processor core represented a slightly modified Pentium® Pro processor core. It has the following differences:
The MMX register set and instruction set was added (see “MMX Capability” on page 519 for a description of MMX).
Four new instructions were added to the instruction set. See “Instruction Set Changes” on page 707.
The L1 Code and Data Cache sizes were increased in size from 8KB each to 16KB each.
While the Pentium® Pro included ECC protection on both the L1 and L2 Caches, the early versions of the Pentium® II did not have ECC protection on the L2 cache. The later versions added it back in.
The Pentium® Pro did not exhibit optimal performance when executing legacy 16-bit code. The Pentium® II corrected this problem ...
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