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 Interest [BCI] lends a helping hand in the Venezuela crisisVenezuela's crisis going on since late 90's has reached catastrophic levels and worsened since the last 2 years.. The country is suffering from...
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Bitcoin (BTC) Market Cap Could Breach $1 Trillion During Next Bull RunBitcoin (BTC) At 13 Digits? Chris Burniske, a partner at Placeholder Ventures, recently remarked that when he recently looked at the...
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Crypto Market Targets Fresh Highs: BNB Eyes $30, Bitcoin Cash, EOS, Tron AnalysisThe total crypto market cap is positioned for more gains above the $180.0B resistance. EOS price is consolidating gains near $5.50 and it...
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Stellar (XLM) Ecosystem Update For April 2019 Features Coinbase, IBM, Smartlands, BlockparkThe world 9th largest cryptocurrency by market cap, Stellar (XLM), seems to trading comparably to stablecoin in the market with 0% added value...
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Waltonchain (WTC) Price Pumps 34% Ahead of Departure from EthereumWaltonchain’s native WTC token gained 34% in the seven days leading up to Saturday, April 20th, as the project gears up to leave the Ethereum...
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MakerDAO Token Holders Vote About Whether to Raise DAI Stability Fee by 3%Token holders are now voting again on whether to raise the so-called stability fee for Maker’s ethereum-based DAI by 3%
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Stock Market Flips Bearish: Analyst Reveals How to Buy the S&P 500 DipBy CCN: Following a banner quarter, one Wall Street analyst says that the US stock market is teetering on the brink of a cooling-off period....
