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  2. Keypunch - Wikipedia

    en.wikipedia.org/wiki/Keypunch

    A key punch room in the 1960s Hand-operated keypunch (manufactured by British ICT) (1960s) Most IBM keypunch and verifiers used a common electrical/mechanical design in their keyboards to encode the mechanical keystrokes. As a key was depressed, a link on the keystem tripped a corresponding set of bails at the top of the keyboard assembly.

  3. Key (engineering) - Wikipedia

    en.wikipedia.org/wiki/Key_(engineering)

    An additional advantage is a stuck key can be removed from a shaft with a hammer blow, the circular profile will push the key out of the slot, as opposed to a standard key which will need to be pushed axially, or pulled out of its slot. Common applications include machine tools, automotive applications, snowblowers and marine propellers.

  4. Key duplication - Wikipedia

    en.wikipedia.org/wiki/Key_duplication

    Key cutting is the primary method of key duplication: a flat key is fitted into a vise in a machine, with a blank attached to a parallel vise, and the original key is moved along a guide, while the blank is moved against a blade, which cuts it.

  5. IBM System/360 Model 25 - Wikipedia

    en.wikipedia.org/wiki/IBM_System/360_Model_25

    The Model 25 logic is built on IBM SLT modules mounted on pluggable cards, which are plugged into printed circuit boards. The boards are mounted on hinged metal gates, and are interconnected by flat cables. The Model 25 is the first IBM system to store its microcode in a rewritable memory, called the control storage. The control storage uses an ...

  6. IBM PS/2 Model 25 - Wikipedia

    en.wikipedia.org/wiki/IBM_PS/2_Model_25

    The Personal System/2 Model 25 and its later submodels the 25 286 and 25 SX are IBM's lowest-end entries in the Personal System/2 (PS/2) family of personal computers. Like its sibling the Model 30, the Model 25 features an Industry Standard Architecture bus, allowing it to use expansion cards from its direct predecessors, the PC/XT and the PC/AT—but not from higher entries in the PS/2 line ...

  7. HP-25 - Wikipedia

    en.wikipedia.org/wiki/HP-25

    The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between early January 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-65. To reduce cost, the HP-25 omitted the HP-65's magnetic card reader, so it could only be programmed using the keyboard ...

  8. Model 25 - Wikipedia

    en.wikipedia.org/wiki/Model_25

    Mitsubishi G4M2b Model 25, an experimental model of the Mitsubishi G4M medium bomber; Consolidated Model 25, a predecessor to the Consolidated P-30 fighter aircraft; Bellanca Model 25 Skyrocket, a prototype light airplane

  9. Heathkit - Wikipedia

    en.wikipedia.org/wiki/Heathkit

    Oscilloscope OL-1 from 1954, the company's first with a relatively small 3-inch CRT which allowed for a highly competitive price of US$ 29.50 (equivalent to $335 in 2023) for the DIY kit. [1] Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company.

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