Documents

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

• Ipso Facto
  The Ipso Facto newsletter was perhaps the biggest and best devoted to 1802 microcomputers. Our small but growing collection of Ipso Facto articles is indexed by issue and by author. Check them out and see what geeks did for fun more than 20 years ago!
  
  
• "A Tale of Two Processors" by Steven and Michael Gemeny
  The day of the 1802 had passed, yet space probes such as Voyager and 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.)
  • CDP1802 Microprocessor (116K)
  • CDP1805/1806 Microprocessors (136K)
  • CDP1821 1024 x 1-Bit RAM (36K)
  • CDP1822 256 x 4-Bit RAM (46K)
  • CDP1823 128 x 8-Bit RAM (29K)
  • CDP1824 32 x 8-Bit RAM (28K)
  • CDP1826 64 x 8-Bit RAM (44K)
  • CDP1831 512 x 8-Bit ROM (481K)
  • CDP18U42 256 x 8-Bit Static EPROM (304K)
  • CDP1851 Programmable I/O Interface (57K)
  • CDP1852 Byte-Wide I/O Port (64K)
  • CDP1853 1 of 8 Decoder (33K)
  • CDP1854 UART (201K)
  • CDP1855 8-Bit Programmable Multiply/Divide Unit (88K)
  • CDP1857 4-Bit Bus Buffer/Separator (26K)
  • CDP1861 Video Display Controller (700K)
  • CDP1862 COS/MOS Color Generator Controller (2.2M)
  • CDP1864 Color TV Interface (372K)
  • CDP1869/1870/1876 Video Interface System (1.4M)
  • CDP1871 Keyboard Encoder (78K)
  • CDP1872/1874/1875 High-Speed 8-Bit Input and Output Ports (36K)
  • CDP1877 Programmable Interrupt Controller (48K)
  • CDP1878 Dual Counter-Timer (62K)
  • CDP1879 CMOS Real-Time Clock (104K)
  • CDP1881/1882 6-Bit Latch and Decoder Memory Interfaces (52K)
  • CDP1883 7-Bit Latch and Decoder Memory Interfaces (36K)
  
  
• 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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