Ken Shirriff's blog
Righto. Computer history, restoring vintage computers, IC reverse engineering, and whatever.
Read Righto.com news digest here: view the latest Righto articles and content updates right away or get to their most visited pages. Righto.com belongs to a group of fairly successful websites, with more than 135K visitors from all over the world monthly. It seems that Righto content is notably popular in USA, as 28.4% of all users (38K visits per month) come from this country. We haven’t detected security issues or inappropriate content on Righto.com and thus you can safely use it. Righto.com is hosted with CloudFlare, Inc. (United States) and its basic language is English.
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Simulating a Xerox Alto with the ContrAlto simulator: games and Smalltalk
The revolutionary Xerox Alto computer came out in 1973 and set the direction for personal computing. If you want to try out the Alto's so...
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Reverse-engineering the LM185 voltage reference chip and its bandgap reference
Many circuits, such as a computer power supply or a phone charger, require a stable voltage reference, but it's harder than you might expec...
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The absurdly complicated circuitry for the 386 processor's registers
The groundbreaking Intel 386 processor (1985) was the first 32-bit processor in the x86 architecture. Like most processors, the 386 contains...
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Computer history, restoring vintage computers, IC reverse engineering, and whatever
Righto.com news digest
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16 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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2 months
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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| Web host: | CloudFlare, Inc. |
| Registrar: | Cloudflare, Inc. |
| Registrant: | DATA REDACTED |
| Updated: | April 30, 2025 |
| Expires: | June 11, 2026 |
| Created: | June 12, 1998 |
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