Motorola introduces its 6800 chip, an early 8-bit microprocessor used in microcomputers and 9 industrial and automotive control devices. The 6800 was designed by Chuck Peddle and Charlie Melear. ALTAIR Altair was one of the first successfully sold personal computer kits for do-it-yourself computing fans. No monitor, no keyboard Keyboard and cassette drive can be added Oscilloscope can be attached to be used as a display ALTO 1974 Xerox releases the Alto computer A personal computer to be used for research , Cost: $32,000 Never produced for profit First serious machine to feature a modern user interface: windows, mouse, etc invented by Engelbart in 1964 Great influence on Macintosh, Great influence on Microsoft C-LANGUAGE C development 1969-1973, Thompson, Ritchie, Kernighan: 1975 Bill Gates and Paul Allen license their newly written BASIC to MITS, their first customer.
S. using a microprocessor, the Intel 8008-based Scelbi-8H, for US$565, with 1KB programmable memory. An additional 15KB is available for US$2760. Bob Metcalfe invents the Ethernet connectivity system. Altair Altair was one of the first successfully sold personal computer kits for do-it-yourself computing fans. No monitor, no keyboard Keyboard and cassette drive can be added Oscilloscope can be attached to be used as a display 1974 Popular Electronics publishes an article by MITS announcing the Altair 8800 computer for US$439 in kit form. It uses the Intel 8080 processor. The Altair pictured on the cover of the magazine is actually a mock-up, as an actual computer was not available. 1974 Alto A personal computer to be used for research Cost: $32,000 Never produced for profit
output) is happening. Combined Logic Analyzer/DSO One problem with both the software and logic-analyzer approach to moni- toring the system parameters is that the digital values may not represent the analog inputs. If a problem occurs because the ADC reference voltage varies too much with temperature, neither of these approaches will detect it because the ADC outputs look correct and the system responds to the ADC output correctly. Figure 5.21B shows the addition of a DSO (digital storage oscilloscope) to the original setup. The DSO monitors the actual sensor signal while the logic analyzer monitors the ADC output and the resulting control output. The DSO trigger is coupled to the logic analyzer trigger output (or vice versa) so that the data on the two instruments can be correlated. Using a logic analyzer with an integrated DSO simplifies the data correlation process. Whether you output monitoring data using software or use external equip-
begins building a small computer based on Intel's new 8080 chip, with plans to sell it for the unheard-of price of US$500. MITS completes the first prototype Altair 8800 microcomputer. Bravo is developed for the Xerox Alto computer. It is the first WYSIWYG program for a personal computer. Altair Altair was one of the first successfully sold personal computer kits for do-it-yourself computing fans. No monitor, no keyboard. Keyboard and cassette drive can be added. Oscilloscope can be attached to be used as a display. Railway Express loses Ed Robert's only prototype Altair computer, en route to New York for review and photography for publishing by Popular Electronics. Les Solomon, publisher of Popular Electronics, receives Altair number 0001. Lauren Solomon, 12 year old daughter of Les Solomon, publisher of Popular Electronics, suggests the name "Altair" for Ed Robert's new microcomputer. Altair was the name of where
wipe the surface. After doing this, install the Unit. Necessary Tools for Standard Tools Inspection • Screwdrivers (Philips and flat-blade) • Voltage tester or digital voltage meter • Industrial alcohol and a cotton cloth Measurement Devices • Synchroscope • Cathode-ray oscilloscope • Thermometer, hydroscope Note Do not take apart, repair or remodel the PC in any way. 136 SECTION 6 Expansion Memory Unit This section describes how to use the CPM1-EMU01-V1 Expansion Memory Unit
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