Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
The complex history of the Intel i960 RISC processor
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The Intel i960 was a remarkable 32-bit processor of the 1990s with a confusing set of versions. Although it is now mostly forgotten (outs...
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The Group Decode ROM: The 8086 processor's first step of instruction decoding
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A key component of any processor is instruction decoding: analyzing a numeric opcode and figuring out what actions need to be taken. The ...
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Reverse-engineering the division microcode in the Intel 8086 processor
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While programmers today take division for granted, most microprocessors in the 1970s could only add and subtract — division required a sl...
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