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ACFA-8
The ACFA-8 (Affordable Computers for All-8) was a microcomputer based on the Motorola 6808. It was released in 1979 by Andrew M. Veronis, a doctorate of computer science more well-known for his books on computer engineering. Description and history The ACFA-8 was a single-board microcomputer running the Motorola 6808. The board's memory layout comprised an array of eight chip sockets, onto which 3 KB or 6 KB DRAM chips can be populated, for a maximum of 48 KB of RAM. As stock it came with 16 KB of RAM. The computer's cassette interface supports the Kansas City standard, and the computer came shipped with 8-KB BASIC on cassette. The board features a built-in color RF modulator; American buyers got shipped a color video display for the price of the computer. Both American and overseas buyers however both got the board with an enclosure, a keyboard, and the power supply unit. The ACFA-8 was one of the few microcomputers based on the 6808 microprocessor, being ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola 6808
The 6800 ("''sixty-eight hundred''") is an 8-bit microprocessor designed and first manufactured by Motorola in 1974. The MC6800 microprocessor was part of the M6800 Microcomputer System (later dubbed ''68xx'') that also included serial and parallel interface ICs, RAM, ROM and other support chips. A significant design feature was that the M6800 family of ICs required only a single five-volt power supply at a time when most other microprocessors required three voltages. The M6800 Microcomputer System was announced in March 1974 and was in full production by the end of that year. "Motorola's M6800 microcomputer system, which can operate from a single 5-volt supply, is moving out of the sampling stage and into full production." The small-quantity price of the MC6800 is . The MC6820 PIA cost . American Microsystems was licensed as the second source. The 6800 has a 16-bit address bus that can directly access of memory and an 8-bit bi-directional data bus. It has 72 instructions with s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronics Today International
''Electronics Today International'' or ETI was a magazine for electronics hobbyists and professionals. Originally started in Australia in April 1971, ''ETI'' was published in the UK in 1972. From there, it expanded to various European countries, including France (where it was started in November 1972) and over to Canada. It was one of the first magazines to publish circuit diagrams for building homebrew computer systems. They also published a monthly series of articles for their "system 68" microcomputer based on the Motorola 6800 Microprocessor, most of them written by John Miller-Kirkpatrick, the dozen or so articles described in detail how to build a M6800 based microcomputer, including a VDU. In that sense it was one of the first computer magazines. The 1970s ''ETI'' was launched by Modern Magazines, a publisher of specialist magazines based in Rushcutters' Bay, Sydney. The magazine was started at the suggestion of Kim Ryrie (later of Fairlight CMI fame), the electron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Maryland, College Park
The University of Maryland, College Park (University of Maryland, UMD, or simply Maryland) is a public university, public Land-grant university, land-grant research university in College Park, Maryland, United States. Founded in 1856, UMD is the Flagship university, flagship institution of the University System of Maryland. It is known as the biggest university in the state of Maryland. UMD is the largest university in Maryland and the Washington metropolitan area. Its eleven schools and colleges offer over 200 degree-granting programs, including 113 undergraduate majors, 107 Master's degree, master's programs, and 83 Doctorate, doctoral programs. UMD's athletic teams are known as the Maryland Terrapins and compete in NCAA Division I as a member of the Big Ten Conference. A member of the Association of American Universities, The University of Maryland's proximity to Washington, D.C. has resulted in many research partnerships with the Federal government of the United States, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porcelain
Porcelain (), also called china, is a ceramic material made by heating Industrial mineral, raw materials, generally including kaolinite, in a kiln to temperatures between . The greater strength and translucence of porcelain, relative to other types of pottery, arise mainly from Vitrification#Ceramics, vitrification and the formation of the mineral mullite within the body at these high temperatures. End applications include tableware, ceramic art, decorative ware such as figurines, and products in technology and industry such as Insulator (electricity), electrical insulators and laboratory ware. The manufacturing process used for porcelain is similar to that used for earthenware and stoneware, the two other main types of pottery, although it can be more challenging to produce. It has usually been regarded as the most prestigious type of pottery due to its delicacy, strength, and high degree of whiteness. It is frequently both glazed and decorated. Though definitions vary, po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annapolis, Maryland
Annapolis ( ) is the capital of the U.S. state of Maryland. It is the county seat of Anne Arundel County and its only incorporated city. Situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east of Washington, D.C., Annapolis forms part of the Baltimore–Washington metropolitan area. The 2020 census recorded its population as 40,812, an increase of 6.3% since 2010. This city served as the seat of the Confederation Congress, formerly the Second Continental Congress, and temporary national capital of the United States in 1783–1784. At that time, General George Washington came before the body convened in the new Maryland State House and resigned his commission as commander of the Continental Army. A month later, the Congress ratified the Treaty of Paris of 1783, ending the American Revolutionary War, with Great Britain recognizing the independence of the United States. The city and state capitol was also the site of the 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleprinter
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point (telecommunications), point-to-point and point-to-multipoint communication, point-to-multipoint configurations. Initially, from 1887 at the earliest, teleprinters were used in telegraphy. Electrical telegraphy had been developed decades earlier in the late 1830s and 1840s, then using simpler Morse key equipment and telegraph operators. The introduction of teleprinters automated much of this work and eventually largely replaced skilled labour, skilled operators versed in Morse code with Data entry clerk, typists and machines communicating faster via Baudot code. With the development of early computers in the 1950s, teleprinters were adapted to allow typed data to be sent to a computer, and responses printed. Some teleprinter models could also be used to create punched tape for Compute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kit (of Components)
A kit is a set of components that has to be assembled by the buyer or at the site of use to get the definitive product. Examples: * Electronic kit, a package of electrical components used to build an electronic device. * Kit car ("component car"), an automobile that the buyer assembles into a functioning car * Kit bike * Folding kayak * Tent * Prefabricated building of houses * provisional military engineering constructions like ** Mabey Logistic Support Bridge * Space station * Much of IKEA furniture * A lot of kits are sold for model building Model building is a hobby and career that involves the creation of physical models either from kits or from materials and components acquired by the builder. The kits contain several pieces that need to be assembled in order to make a final mode ... {{Tech-stub Construction Kit cars ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola 6800 Family
The M6800 Microcomputer System (latter dubbed the Motorola 6800 family, M6800 family, or 68xx) was a series of 8-bit microprocessors and microcontrollers from Motorola that began with the 6800 CPU. The architecture also inspired the MOS Technology 6502, and that company started in the microprocessor business producing 6800 replacements. The chips primarily competed against Intel's 8-bit family of chips (such as the 8080, or their relations, the Zilog Z80 range). * Motorola 6800 * Motorola 6801 (includes RAM and ROM)http://datasheets.chipdb.org/Motorola/mc6801_3.pdf * Motorola 6802 (includes RAM and an internal clock oscillator) * Motorola 6803 (includes RAM) * Motorola 6805 * Motorola 6808 (6802 that had failed production test of its internal RAM; Its RAM enable pin was designated GND) * Motorola 6809 * Hitachi 6301 used in the Psion Organiser I * Hitachi HD6303 used in the Psion Organiser II, Yamaha's KX88 MIDI keyboard and Yamaha DX7 synthesizer and Roland TR-707 dr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microcomputer
A microcomputer is a small, relatively inexpensive computer having a central processing unit (CPU) made out of a microprocessor. The computer also includes memory and input/output (I/O) circuitry together mounted on a printed circuit board (PCB). Microcomputers became popular in the 1970s and 1980s with the advent of increasingly powerful microprocessors. The predecessors to these computers, mainframes and minicomputers, were comparatively much larger and more expensive (though indeed present-day mainframes such as the IBM System z machines use one or more custom microprocessors as their CPUs). Many microcomputers (when equipped with a keyboard and screen for input and output) are also personal computers (in the generic sense). An early use of the term "personal computer" in 1962 predates microprocessor-based designs. ''(See "Personal Computer: Computers at Companies" reference below)''. A "microcomputer" used as an embedded control system may have no human-readable input and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Supply Unit (computer)
A power supply unit (PSU) converts Mains electricity, mains AC to low-voltage regulated DC power for the internal components of a desktop computer. Modern personal computers universally use switched-mode power supply, switched-mode power supplies. Some Power supply, power supplies have a manual switch for selecting input voltage, while others automatically adapt to the main voltage. Most modern desktop personal computer power supplies conform to the ATX, ATX specification, which includes form factor and voltage tolerances. While an ATX power supply is connected to the mains supply, it always provides a 5-volt standby (5VSB) power so that the standby functions on the computer and certain peripherals are powered. ATX power supplies are turned on and off by a signal from the motherboard. They also provide a signal to the motherboard to indicate when the DC voltages are in spec, so that the computer is able to safely power up and boot. The most recent ATX PSU standard is version 3.0 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
