Ken Shirriff's Blog
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A look at IBM S/360 core memory: In the 1960s, 128 kilobytes weighed 610 poundsI recently received a vintage core memory array, part of an IBM System/360 mainframe computer. These arrays were used in a 128-kilobyte core...
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Iconic consoles of the IBM System/360 mainframes, 55 years old todayThe IBM System/360 was a groundbreaking family of mainframe computers announced on April 7, 1964. Designing the System/360 was an extremely...
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Op amp on the Moon: Reverse-engineering a hybrid op amp moduleI recently obtained a mysterious electronic component in a metal can, flatter and slightly larger than a typical integrated circuit. 1 After...
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Inside the Apollo Guidance Computer's core memoryThe Apollo Guidance Computer (AGC) provided guidance, navigation and control onboard the Apollo flights to the Moon. This historic computer was...
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Accounting machines, the IBM 1403, and why printers standardized on 132 columnsHave you ever wondered why 132 characters is such a common width for printers? Many printers produced lines of 132 characters, such as the...
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Hammer time: fixing the printer on a vintage IBM 1401 mainframeThe Computer History Museum has two operational IBM 1401 computers used for demos but one of the printers stopped working a few weeks ago....
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Two bits per transistor: high-density ROM in Intel's 8087 floating point chipThe 8087 chip provided fast floating point arithmetic for the original IBM PC and became part of the x86 architecture used today. One unusual...
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Bad relay: Fixing the card reader for a vintage IBM 1401 mainframeAs soon as we finished repairing a printer failure at the Computer History Museum , Murphy's law struck and the card reader started...
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The printer that wouldn't print: Fixing an IBM 1401 mainframe from the 1960sThe Computer History Museum has two operational IBM 1401 computers used for demos , but a few weeks ago one computers suddenly couldn't print...
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Glowing mercury thyratrons: inside a 1940s Teletype switching power supplyWe recently started restoring a Teletype Model 19, a Navy communication system introduced in the 1940s. 14 This Teletype was powered by a bulky...
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Bitcoin & ALT Coin Crypto Miner Rig - 4 GPU nVIdia 1080 Ti$1,699.00 End Date: Monday Jul-15-2019 6:51:42 PDT Buy It Now for only: $1,699.00 Buy It Now | Add to watch list
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Elon Musk Spreads FOMO with California Tax-Infused Tesla Sales PitchBy CCN Markets: Elon Musk is bringing the FOMO, or Fear of Missing Out. The Tesla CEO tweeted out a reminder that federal tax credits for buying a...
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Crypto Market Rallies $15 Billion: Bitcoin Cash, Litecoin, EOS, XLM AnalysisThe total crypto market cap gained momentum and broke the key $252.0B resistance area. Bitcoin price surged above the $8,500 and $8,650...
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Crypto Tidbits: Bakkt’s Bitcoin Futures Near, Facebook’s Libra Backed by Uber, Binance to Block US ClientsAnother week, another round of Crypto Tidbits. It would be fair to say that the past seven days for Bitcoin (BTC) and its ilk have been rather...
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Hong Kong Protests Could Boost Bitcoin as Wealthy Move Assets OffshoreBitcoin could be boosted by the current political unrest Hong Kong as the upper and middle classes are reportedly starting to move their...
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Court Compels ‘Fake Satoshi’ Craig Wright to Produce Complete List of Bitcoin He Mined Before Dec. 2018A Federal high court sitting in Florida has granted the motion to compel filed by Ira Kleiman, who is a personal representative of the estate of...
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Bitcoin May go Parabolic at 60% Dominance but Altcoins will Suffer – AnalystBitcoin Price has been on the rise and so has its dominance. It has so far broken two key resistances at $8,200 and $8,550, rising as high as...
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Crypto Exchange Bittrex Delists 40+ Altcoins for US Clients: Regulatory PressureCrypto Assets Delisted En-Masse on US Exchanges As Bitcoin (BTC) has returned, regulatory pressure on crypto assets and their respective...
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$10 Billion Flows Back into Crypto Markets Despite Binance FUDCrypto markets surge $10 billion on Saturday; Bitcoin leading, Litecoin, EOS, XMR and NEO following, BNB sliding. Market Wrap Despite a...
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Google Teaches Ethereum: Inside Google’s Cloud-Blockchain Ethereum HybridBy CCN Markets: So, you may have heard that Google Cloud Services now support Ethereum smart contracts. Not only that, but Google is expending its...
