Fairchild F8 - ορισμός. Τι είναι το Fairchild F8
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Τι (ποιος) είναι Fairchild F8 - ορισμός

8-BIT MICROPROCESSOR
  • KB]]}} 8-bit personal computer which interfaced to a Teletype. The design permitted additional interfaces to floppy disk and other devices. A program called Fairbug, which resided in a 1K PSU, allowed users to view and change memory and registers, and test programs written in the machine code. This device appeared at the beginning of the transition from time shared computers to personal computers.

Fairchild F8         
<processor> An 8-bit microprocessor. The processor itself had no address bus - program and data memory access were contained in separate units, which reduced the number of pins and the associated cost. It also featured 64 registers, accessed by the ISAR register in cells (register windows) of eight, which meant external RAM wasn't always needed for small applications. In addition, the 2-chip processor didn't need support chips, unlike others which needed seven or more. The F8 inspired other similar CPUs, such as the {Intel 8048}. The use of the ISAR register allowed a subroutine to be entered without saving a bunch of registers, speeding execution - the ISAR would just be changed. Special purpose registers were stored in the second cell (regs 9-15), and the first eight registers were accessed directly. The windowing concept was useful, but only the register pointed to by the ISAR could be accessed - to access other registers the ISAR was incremented or decremented through the window. (1994-11-16)
Fairchild F8         
The Fairchild F8 is an 8-bit microprocessor system from Fairchild Semiconductor, announced in 1974 and shipped in 1975. The original processor family included four main 40-pin integrated circuits (ICs); the 3850 CPU which was the arithmetic logic unit, the 3851 Program Storage Unit (PSU) which contained of program ROM and handled instruction decoding, and the 3852 Dynamic Memory Interface (DMI) or 3853 Static Memory Interface (SMI) to control additional RAM or ROM holding the user programs or data.
Fairchild Aircraft Ltd.         
  • Bolingbroke IVT in the Commonwealth Air Training Plan Museum, Brandon, Manitoba
  • Fairchild 71C at the [[Western Canada Aviation Museum]], [[Winnipeg]], [[Manitoba]] in [[Canadian Airways]] livery
  • Fairchild PT-26B Cornell in flying condition at the [[Commonwealth Air Training Plan]] Museum, [[Brandon, Manitoba]], 2005
  • Fairchild F-11-2 on display at the [[Western Canada Aviation Museum]], [[Winnipeg]], [[Manitoba]] c. 2007
1920-1950 AIRCRAFT MANUFACTURER IN CANADA
Fairchild Aircraft Ltd; Fairchild (Canada); Fairchild Aircraft Ltd. (Canada)
Fairchild Aircraft Ltd. was an aircraft manufacturer active at Longueuil, Quebec, Canada in the period 1920–50.

Βικιπαίδεια

Fairchild F8

The Fairchild F8 is an 8-bit microprocessor system from Fairchild Semiconductor, announced in 1974 and shipped in 1975. The original processor family included four main 40-pin integrated circuits (ICs); the 3850 CPU which was the arithmetic logic unit, the 3851 Program Storage Unit (PSU) which contained 1 KB of program ROM and handled instruction decoding, and the 3852 Dynamic Memory Interface (DMI) or 3853 Static Memory Interface (SMI) to control additional RAM or ROM holding the user programs or data. The 3854 DMA was an optional system that added direct memory access into the RAM controlled by the 3852.

A minimal system containing a 3850 and 3851 also included four 8-bit data ports, 64 bytes of RAM, and a user program on ROM. This allowed microcontroller applications to be built using just two chips. It also meant that any application that did not fit the simple requirements generally required at least three 40-pin ICs, the CPU, PSU and either the 3852 or 3853 along with additional memory chips. As a result of these tradeoffs, the F8 series found widespread use in the microcontroller market but saw less use as a CPU in general-purpose computers. It is relatively obscure today, as its embedded uses rarely revealed the F8 inside.

In 1977, Mostek released a greatly improved single-chip implementation, the Mostek 3870. It merged the 3850 and 3851 and reduced the number of power supply voltages. More important, Mostek re-arranged the assembly line so user code in ROM was added at the last step, greatly reducing the cost of customizing the design for controller use. The 3870 replaced the original Fairchild versions and was produced by several companies in the US and Europe. In Europe, STMicroelectronics continued producing variations of the design into the mid-1990s.