Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Reverse-engineering the carry-lookahead circuit in the Intel 8008 processor

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The 8008 was Intel's first 8-bit microprocessor, introduced in 1972. While primitive by today's standards, the 8008 is historicall...
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Inside the stacked RAM modules used in the Apple III

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In 1978, a memory chip stored just 16 kilobits of data. To make a 32-kilobit memory chip, Mostek came up with the idea of putting two 16K ...
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How the bootstrap load made the historic Intel 8008 processor possible

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Near the end of 1972, Intel introduced their first 8-bit microprocessor, the 8008. Decades later, this processor still influences computi...
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How to multiply currents: Inside a counterfeit analog multiplier

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A recent Twitter thread about a counterfeit analog multiplier chip attracted my attention since I'm interested in both counterfeit in...
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