Ken Shirriff's blog
Arcfn. Computer history, restoring vintage computers, IC reverse engineering, and whatever.
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Computer history, restoring vintage computers, IC reverse engineering, and whatever
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1 indicates the presence of a transistor and a . indicates the absence. If a transistor is present, the corresponding input line must be low or else the output will be pulled low. Most of the input...
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This page shows how to create new Mandelbrot-like fractals by using fractional exponents.
Arcfn.com news digest
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14 days
Notes on the Intel 8086 processor's arithmetic-logic unit
In 1978, Intel introduced the 8086 processor, a revolutionary chip that led to the modern x86 architecture.Unlike modern 64-bit processors, however, the 8086 is a 16-bit chip.Its arithmetic/logic unit (ALU) operates on 16-bit values, performing arithmetic...
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1 month
Conditions in the Intel 8087 floating-point chip's microcode
In the 1980s, if you wanted your computer to do floating-point calculations faster, you could buythe Intel 8087 floating-point coprocessor chip.Plugging it into your IBM PC would make operations up to 100 times faster, a big boost for spreadsheetsand...
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1 month
The stack circuitry of the Intel 8087 floating point chip, reverse-engineered
Early microprocessors were very slow when operating with floating-point numbers.But in 1980, Intel introduced the 8087 floating-point coprocessor, performingfloating-point operations upto 100 times faster.This was a huge benefit for IBM PCapplications...
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2 months
Unusual circuits in the Intel 386's standard cell logic
I've been studying the standard cell circuitry in the Intel 386 processor recently.The 386, introduced in 1985, was Intel's most complex processor at the time, containing 285,000 transistors.Intel's existing design techniques couldn't handle this complexity...
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