Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
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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HP Nanoprocessor part II: Reverse-engineering the circuits from the masks
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In 1974, Hewlett-Packard developed a microprocessor for control applications in their products, from floppy disk drives to voltmeters. Thi...
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