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COP400
The COP400 or COP II is a 4-bit microcontroller family introduced in 1977 by National Semiconductor as a follow-on product to their original PMOS COP microcontroller. COP400 family members are complete microcomputers containing internal timing, logic, ROM, RAM, and I/O necessary to implement dedicated controllers. Some COP400 devices were second-sourced by Western Digital as the WD4200 family. In the Soviet Union several COP400 microcontrollers were manufactured as the 1820 series (e.g. the COP402 with designation ''КР1820ВЕ1''). The COP400 is implemented in CMOS or N-channel silicon gate MOS technology. It was typically packaged in 24- or 28-pin DIP packages. Instruction cycle time of the faster family members is 4 microseconds. The COP400 family offered several memory and pinout configurations. Memory The COP400 uses separate memory spaces for ROM and RAM. ROM addresses are 11-bit maximum, while data addresses are 7-bit maximum. ROM Program memory consists of a 512, 1024 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
COP8
The National Semiconductor COP8 is an 8-bit CISC core microcontroller. COP8 is an enhancement to the earlier COP400 4-bit microcontroller family. COP8 main features are: * Large amount of I/O pins * Up to 32 KB of Flash memory/ROM for code and data * Very low EMI (no known bugs) * Many integrated peripherals (meant as single chip design) * In-System Programming * Free assembler toolchain. Commercial C compilers available * Free Multitasking OS and TCP/IP stack It has a machine cycle of up to 2M cycles per second, but most versions seem to be overclockable to up to 2.8M cycles per second (28 MHz clock). Registers and memory map The COP8 uses separate instruction and data spaces (Harvard architecture). Instruction address space is 15-bit (32 KiB maximum), while data addresses are 8-bit (256 bytes maximum, extended via bank-switching). To allow software bugs to be caught, all invalid instruction addresses read as zero, which is a trap instruction. Invalid RAM ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grundy Newbrain
The Grundy NewBrain was a microcomputer sold in the early 1980s by Grundy Business Systems Ltd of Teddington and Cambridge, England. Beginnings The NewBrain project was started in 1978 when Sinclair Radionics began design work with Mike Wakefield as the designer and Basil Smith as the software engineer. This project was intended to provide competition for Apple and hardly fitted in with Sinclair's focus on inexpensive consumer-oriented products. When it became obvious to Sinclair that the NewBrain could not be made for the sub-£100 price he envisaged, his thoughts turned to the ZX80 that was to be developed by his other company, Science of Cambridge Ltd. The NewBrain project was moved to Newbury Laboratories by the National Enterprise Board (NEB), the owner of both Sinclair Radionics and Newbury Labs, following the closure of Sinclair Radionics. In 1980, Newbury announced the imminent release of three NewBrain models, including a battery-powered portable computer. BBC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Semiconductor
National Semiconductor was an American semiconductor manufacturer which specialized in analog devices and subsystems, formerly with headquarters in Santa Clara, California. The company produced power management integrated circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. National's key markets included wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial and test and measurement applications. On September 23, 2011, the company formally became part of Texas Instruments as the "Silicon Valley" division. History Founding National Semiconductor was founded in Danbury, Connecticut, by Dr. Bernard J. Rothlein on May 27, 1959, when he and seven colleagues, Edward N. Clarke, Joseph J. Gruber, Milton Schneider, Robert L. Hopkins, Robert L. Koch, Richard R. Rau and Arthur V. Siefert, left their employment at the semiconductor division of Sperry Rand Corp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exclusive Or
Exclusive or or exclusive disjunction is a logical operation that is true if and only if its arguments differ (one is true, the other is false). It is symbolized by the prefix operator J and by the infix operators XOR ( or ), EOR, EXOR, , , , , , and . The negation of XOR is the logical biconditional, which yields true if and only if the two inputs are the same. It gains the name "exclusive or" because the meaning of "or" is ambiguous when both operands are true; the exclusive or operator ''excludes'' that case. This is sometimes thought of as "one or the other but not both". This could be written as "A or B, but not, A and B". Since it is associative, it may be considered to be an ''n''-ary operator which is true if and only if an odd number of arguments are true. That is, ''a'' XOR ''b'' XOR ... may be treated as XOR(''a'',''b'',...). Truth table The truth table of A XOR B shows that it outputs true whenever the inputs differ: Equivalences, elimination, and introduc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Fluorescent Display
A vacuum fluorescent display (VFD) is a display device once commonly used on consumer electronics equipment such as video cassette recorders, car radios, and microwave ovens. A VFD operates on the principle of cathodoluminescence, roughly similar to a cathode ray tube, but operating at much lower voltages. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament.Chen, J., Cranton, W., & Fihn, M. (Eds.). (2016). Handbook of Visual Display Technology. doi:10.1007/978-3-319-14346-0 page 1610 onwards In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh control grid. Unlike liquid crystal displays, a VFD emits very bright light with high contrast and can support display elements of various colors. Standard illumination figures for VFDs are around 640 cd/m2 with high-brightness VFDs operating at 4,000 cd/m2, and experimental units as high as 35,000 cd/m2 depending on the drive vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entex Industries
Entex Industries, Inc. was an American toy and electronic game manufacturer based in Compton, California. The company was active during the 1970s and 1980s. Background The company was formed in 1970 by ''G.A. (Tony) Clowes'', ''Nicholas Carlozzi'' and ''Nick Underhill''. It was based at 303 West Artesia Blvd, Compton. Its name was derived from taking Nicholas' and Tony's initials and adding an 'X' on the end to form ''NTX'', which when spoken sounds like ''Entex''. Nick Underhill's initial was not included as he had joined the company after the name had already been chosen, but before it opened for business. The company logo consisted of an RAF bullseye with a smiling face in the middle. In 1980, the company achieved sales in excess of $100 million. The company folded in the early eighties, due in part to increasing competition from video game consoles and computer games which quickly became a preferred form of entertainment, much to the cost of the electronic games industry. Pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coleco
Coleco Industries, Inc. was an American company founded in 1932 by Maurice Greenberg as The Connecticut Leather Company. It was a successful toy company in the 1980s, mass-producing versions of Cabbage Patch Kids dolls and its video game consoles, the Coleco Telstar dedicated consoles and ColecoVision. While the company ceased operations in 1988 as a result of bankruptcy, the Coleco brand was revived in 2005, and remains active to this day. Overview Coleco Industries, Inc. began in 1932 as The Connecticut Leather Company. The business supplied leather and "shoe findings" (the supplies and paraphernalia of a shoe repair shop) to shoe repairers. In 1938, the company began selling rubber footwear. During World War II demand for the company's supplies increased and by the end of the war, the company was larger and had expanded into new and used shoe machinery, hat cleaning equipment and marble shoeshine stands. By the early 1950s, and thanks to Maurice Greenberg's son, Leonard Gree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milton Bradley Company
Milton Bradley Company or simply Milton Bradley (MB) was an American board game manufacturer established by Milton Bradley in Springfield, Massachusetts, in 1860. In 1920, it absorbed the game production of McLoughlin Brothers, formerly the largest game manufacturer in the United States. It became a division of Hasbro in 1984. History Foundation Milton Bradley found success making board games. In 1860, Milton Bradley moved to Springfield, Massachusetts, and set up the state's first color lithography shop. Its graphic design of Abraham Lincoln sold very well, until Lincoln grew his beard and rendered the likeness out-of-date. Struggling to find a new way to use his lithography machine, Bradley visited his friend George Tapley. Tapley challenged him to a game, most likely an old English game. Bradley conceived the idea of making a purely American game. He created ''The Checkered Game of Life'', which had players move along a track from Infancy to Happy Old Age, in which t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mattel
Mattel, Inc. ( ) is an American multinational toy manufacturing and entertainment company founded in January 1945 and headquartered in El Segundo, California. The company has presence in 35 countries and territories and sells products in more than 150 countries. The company operates through three business segments: North America, International, and American Girl. It is the world's second largest toy maker in terms of revenue, after The Lego Group. Two of its historic and most valuable brands, Barbie and Hot Wheels, were respectively named the top global toy property and the top-selling global toy of the year for 2020 and 2021 by The NPD Group, a global information research company. The name of the company is a portmanteau of the names of two of the company's founders; the surname of Harold Matson and the first name of Elliot Handler. History Origins and early years Harold "Matt" Matson, Ruth Handler, and Elliot Handler founded Mattel as Mattel Creations in January 1945 in a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple Lisa
Lisa is a desktop computer developed by Apple, released on January 19, 1983. It is one of the first personal computers to present a graphical user interface (GUI) in a machine aimed at individual business users. Its development began in 1978. It underwent many changes before shipping at with a five-megabyte hard drive. It was affected by its high price, insufficient software, unreliable Apple FileWare floppy disks, and the immediate release of the cheaper and faster Macintosh. Only 10,000 were sold in two years. Considered a commercial failure (albeit one with technical acclaim), Lisa introduced a number of advanced features that reappeared on the Macintosh and eventually IBM PC compatibles. Among them is an operating system with protected memory and a document-oriented workflow. The hardware was more advanced overall than the forthcoming Macintosh 128K; the Lisa included hard disk drive support, capacity for up to 2 megabytes (MB) of random-access memory (RAM), expansion slo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arithmetic Logic Unit
In computing, an arithmetic logic unit (ALU) is a Combinational logic, combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers. This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units (GPUs). The inputs to an ALU are the data to be operated on, called operands, and a code indicating the operation to be performed; the ALU's output is the result of the performed operation. In many designs, the ALU also has status inputs or outputs, or both, which convey information about a previous operation or the current operation, respectively, between the ALU and external status registers. Signals An ALU has a variety of input and output net (electronics), nets, which are the electrical conductors used to convey Digital signal (electronics), digi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Architectural State
Architectural state is the collection of information in a computer system that defines the state of a program during execution. Architectural state includes main memory, architectural registers, and the program counter. Architectural state is defined by the instruction set architecture and can be manipulated by the programmer using instructions. A core dump is a file recording the architectural state of a computer program at some point in time, such as when it has crashed. Examples of architectural state include: * Main Memory (Primary storage) * Control registers ** Instruction flag registers (such as EFLAGS in x86) ** Interrupt mask registers ** Memory management unit registers ** Status registers * General purpose registers (such as AX, BX, CX, DX, etc. in x86) ** Adder registers ** Address registers ** Counter registers **Index registers ** Stack registers ** String registers Architectural state is not microarchitectural state. Microarchitectural state is hidden ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
