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This collection of documents and scans recalls a time when any self-respecting computer enthusiast kept a soldering iron close at hand.

  • "Captain Cosmo's Whizbang" by Jeff Duntemann
    If you threw together your own ELF back in the 70s, odds are good that you were motivated by fun more than anything else. Captain Cosmo's Whizbang is an entertaining collection of articles and meanderings that really captures the spirit of the day. Jeff went on to professionally edit and author many other magazines, stories, and books. We're grateful to him for making this available to the world once again. Over 30 years later, it's still a fun read!

  • Ipso Facto
    The Ipso Facto newsletter was perhaps the biggest and best devoted to 1802 microcomputers. We now have a complete set of scans indexed by issue and a smaller set of articles indexed by author. Check them out and see what geeks did for fun more than 20 years ago!

  • "Design Ideas Book for the CDP1802 COSMAC Microprocessor" by the RCA Applications Team
    One of the authors, Juergen Pintaske, scanned this one in. Juergen is a former Microprocessor Applications Engineer with RCA in Brussels. (Paul Sferazza of Intersil kindly granted permission for cosmacelf.com to publish this PDF for the community.)

  • "RCA Microprocessor/Memory Applications Briefs" by RCA
    This collection of application notes was culled from RCA's Solid State News and published in July of 1981.(Intersil's permission.)

  • "A Tale of Two Processors" by Steven and Michael Gemeny
    The day of the 1802 had passed, yet space probes such as Galileo continued to function decades later. The longevity of such projects presents challenges in retaining intimate knowledge of systems that cannot be replaced or upgraded once deployed. In this July 2003 paper prepared for NASA's Jet Propulsion Laboratory, Steve and Michael Gemeny explore the resurrection of a COSMAC ELF and an HP 2000 minicomputer for lessons applicable to the New Horizons mission to Pluto. (Published on cosmacelf.com by permission of Steve Gemeny of Johns Hopkins University, Applied Physics Laboratory.)

  • "A Short Course In Programming" by Tom Pittman
    This may well be the best tutorial on 1802 programming ever written. Without resorting to technical jargon, Pittman introduces microprocessor features step-by-step. We're proud to reproduce this work here with the author's help and permission. Thanks go also to Lee Hart, who meticulously translated the OCR scans to HTML (220K) for publication.

  • 1802 Data Sheets (and then some)
    The folks at Intersil and elsewhere were kind enough to let us provide some of their 1800 series data sheets here in PDF format. (Intersil's permission.)
  • Netronics ELF II Ad
    This enthusiastic advertisment appeared in the January 1979 Radio Electronics. The scan is 103K in size.

  • Netronics Flyer Page 1, Page2, Page 3, and Page 4
    This old flyer from Netronics Research and Development details their ELF II and some of the options available for it. Each scan is about 145K in size.

  • RCA VP-111 Flyer Page 1 and Page 2
    Compared to the Netronics advertisement, RCA sounds downright conservative in this flyer. Still, you can sense the excitement that prevailed at the dawn of the microcomputer. Scans are both about 80K in size.

  • Child Odyssey Kit Advertisement
    This small ad from a December 1977 Byte magazine shows another very simple 1802-based computer from an outfit called Child Odyssey Enterprises Inc. in New Mexico. Little else is known about this one; it seems to be somewhat rare.

  • DeFacto Introduction
    This letter accompanied DeFacto, a compilation of the first three years of the Association of Computer Experimenters newsletter, Ipso Facto. In it, Michael Franklin discusses the origin of ACE and the hardware standards adopted by the club. Small, HTML.

  • ACE CPU Card Schematics Page 1, Page 2, and Page 3
    Instructions Page 1, Page 2, Page 3, and Page 4

    The Association of Computer Experimenters released their own CPU board sometime in 1982. The board had sockets for RAM and EPROM to permit standalone operation, as well as a 44-pin edge connector allowing it to run as the controller in an ACE bus system. DIP switches on the card selected the address the CDP1802 would jump to on reset.

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