Recent Submissions

  • History of the Gilman mining district 

    Contributor:Raines, Ed; Colorado School of Mines. Geology Museum; Colorado School of Mines. Arthur Lakes Library
    Date:2018-08-02
    Ed Raines, a geologist, mineralogist, and mining historian, talks about the history of the Gilman mining district. This lecture provides an overview of the mineralization in this area and includes information about zinc ...
  • Geology of the Gilman mining district 

    Contributor:Raines, Ed; Colorado School of Mines. Geology Museum; Colorado School of Mines. Arthur Lakes Library
    Date:2018-08-09
    Ed Raines, a geologist, mineralogist, and mining historian, explains the geologic history of Gilman and goes on to describe the minerals found in the area.
  • HP-55 

    Contributor:Hewlett-Packard Company
    Date:2018
    The HP-55 programmable calculator came out a year after the HP-67 for a much lower price. It only had 49 lines of program memory (as compared to the HP-67's 224 lines). It did however offer twice as many storage registers, ...
  • TI-1250 SR-11 

    Contributor:Texas Instruments
    Date:2018
    The TI-1250 was considered a "fully-loaded" four-function calculator in 1975 operating on 9V batteries. The calculator is accurate up to 8 digits and features a red LED display. Originally it was manufactured in the United ...
  • HP-67 

    Contributor:Hewlett-Packard Company
    Date:2018
    Described as "a major leap forward in fully-programmable personal calculators, the HP-67 is the most powerful personal calculators HP has ever made." Features include: fully merged keycodes, more memory (224 merged program ...
  • HP Thermal Printer 82162A 

    Contributor:Hewlett-Packard Company
    Date:2018
    An accessory to the programmable calculators, this HP thermal printer prints on command and can be used to trace work and program execution. The HP thermal printer 82162A also features both printing and plotting functions. ...
  • HP-75C 

    Contributor:Hewlett-Packard Company
    Date:2018
    The HP-75C was HP's first portable computer. It ran BASIC and came with 16K of RAM with an expansion port for additional RAM and 48K of ROM with 3 ROM expansion ports. Adjusted for inflation using the consumer price Index, ...
  • Hard Disk Drive (Destroyed) 

    Contributor:Unknown
    Date:2018
    Hard disk drives are non-volatile, random access devices for digital data. They are comprised of rotating rigid plates or motor-driven spindle within a protective enclosure. An example of a complete hard disk drive is ...
  • Magnetic Tape 

    Contributor:Unknown
    Date:2018
    Magnetic tape, first used for data storage on the UNIVAC I computer in 1951, was the de facto standard used for large computer systems through the 1980s. The large 8" open reels were gradually replaced with cartridge tape ...
  • HP-41CV 

    Contributor:Hewlett-Packard Company
    Date:2018
    The HP41C series programmable calculators offered the first alphanumeric capabilities and featured ports for memory expansion. The HP-41CV calculator offered 4 ports for memory expansion and ultimately provided 5 times the ...
  • Compucorp 322G Scientist 

    Contributor:Compucorp
    Date:2018
    This programmable calculator holds one program up to 80 steps and is precise up to 13 digits. It operates using both algebraic and Trigonometric functions and was originally marketed as having a "groovy" orange plasma ...
  • Intel 80386 Processor 

    Contributor:Intel
    Date:2018
    Also known as the i386, this was a 32 bit processor chip introduced by Intel in 1985. The first versions had 275,000 transistors and were used as the central processing unit (CPU) of many workstations and high end personal ...
  • Punch cards 

    Contributor:Unknown
    Date:2018
    First used in 1725 for textile looms in France, punch cards contain digit information represented by the presence or absence of holes in predefined positions. Now considered an obsolete recording system, punch cards were ...
  • Iomega Zip 100 

    Contributor:Iomega
    Date:2018
    The Iomega Zip 100 is designed for PCs, and provides 100 MB of parallel port external storage. This allows for 100 MB of data to be transported on removable media and uses a disk resembling a thicker floppy disk. Its ...
  • Thacher's Calculating Instrument 

    Contributor:Unknown
    Date:2018
    Invented by Edwin Thacher, an American bridge engineer. Patented in 1881, production of this 20-scale cylindrical slide rule was assumed by Keuffel and Esser Co. of New York by 1897. This unit dates to approximately 1920, ...
  • NeXTstep Object Oriented Software 

    Contributor:NeXT
    Date:2018
    NeXT was founded in 1985 by Apple co-founder Steve Jobs. Sales of the NeXT computers were relatively limited, with estimates of about 50,000 units shipped in total. Nevertheless, its innovative object-oriented Nextstep ...
  • Floppy Disk Storage 

    Contributor:Unknown
    Date:2018
    A floppy disk is made up of a thin piece of magnetic media sealed in a square or rectangular plastic carrier. Capacities varied from 180 KB to 1.44 MB. Contrary to logic, the capacity increased as the size decreased. Floppy ...
  • Punched Paper Tape 

    Contributor:Unknown
    Date:2018
    In 1846, Alexander Bain (the inventor of the electric clock) was the first to use punched tape to send telegrams. Paper tapes are now a largely obsolete form of data storage, must like the punch cards consisting of systematic ...
  • IBM Port-A-Punch 

    Contributor:IBM
    Date:2018
    IBM's Supplies Division introduced the Port-A-Punch in 1958 as a fast accurate means of manually punching holes in specially scored IBM punched cards. Designed to fit in the pocket, Port-A-Punch made it possible to create ...
  • General Ceramics Ferrite Core Memory 

    Contributor:Unknown
    Date:2018
    Magnetic-core memory is an early form of random-access computer memory. It uses tiny magnetic rings, the cores, through which wires are threaded to write and read information. Each core represents one bit of information. ...

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