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Museum of Electronics |
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 1982 - Ampex 16KB core memory |
 Magnification #1 |
 Magnification #2 |
 Deforest Audion |
 Loebe Julie: Unsung hero pioneered op amp |
 FX227 Thyratron |
 CX1585 Thyratron |
 Type52 Freq Std TI494 Transistor |
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write-only memory n. The obvious antonym to `read-only memory'. Out of frustration with the long and seemingly useless chain of approvals required of component specifications, during which no actual checking seemed to occur, an engineer at Signetics once created a specification for a write-only memory and included it with a bunch of other specifications to be approved. This inclusion came to the attention of Signetics management only when regular customers started calling and asking for pricing information. Signetics published a corrected edition of the data book and requested the return of the `erroneous' ones. Later, in 1972, Signetics bought a double-page spread in "Electronics" magazine's April issue and used the spec as an April Fools' Day joke. Instead of the more conventional characteristic curves, the 25120 "fully encoded, 9046 x N, Random Access, write-only-memory" data sheet included diagrams of "bit capacity vs. Temp.", "Iff vs. Vff", "Number of pins remaining vs. number of socket insertions", and "AQL vs. selling price". The 25120 required a 6.3 VAC VFF supply, a +10V VCC, and VDD of 0V, ± 2%. |
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 TI3500 Calculator Neon Plasma Display |
 PRI Scintillator 111,111B,111C,117 |
 Docs / Inside / Museum |
 Electronics Illustrated Vacuum Tube Calculator |
 Cracking the IPhone |
 The Original PIC |
 404 Pages |
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| Systron Donner 6150 Counter/Timer | |||
 Counting |
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| HP5245L Counter | |||
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| Nixie Counters | |||
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Anadex CP-101-6R Preset Counter Burroughs B-5092 tubes ca. 1965, $15 (working) |
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| Interesting Patents | |||
 Hedy Lamarr-Markey Frequency Hopping (Basis of CDMA) |
 Larry Bradley decided to submit this after I explained it to him... He has absolutely no ethics! |
 Active Rebate Denial |
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 Burroughs SelfScan gas plasma display |
 Dog Entertainment! |
 Backward Wave Oscillator Example |
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