Ken Shirriff's blog

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

Reverse-engineering the clock chip in the first MOS calculator

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In 1969, Sharp introduced the first calculator built from high-density MOS chips, the QT-8D , followed by the handheld Sharp EL-8, the worl...
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Reverse engineering RAM storage in early Texas Instruments calculator chips

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Texas Instruments introduced the first commercial single-chip computer in 1974, combining the CPU, RAM, ROM, and I/O into one chip. This f...
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Reverse-engineering the classic MK4116 16-kilobit DRAM chip

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Back in the late 1970s, the most popular memory chip was Mostek's MK4116, holding a whopping (for the time) 16 kilobits. It provided ...
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