8250 - definition. What is 8250
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%ما هو (من)٪ 1 - تعريف

8250A; 8250 series; 8250; 8250 UART chip; 8250 (UART); INS8250; PC8250A; INS8250A
  • Commodore PC30-III]])
  • The National Semiconductor 8250 UART chip, one of the most prolific and most cloned UART chips.

8250         
<hardware> A UART that can operate at a maximum of 9600 baud. The 8250 is used in IBM PC XT computers. It works in an IBM PC AT under DOS but generates unwanted interrupts when used at 9600 baud. The IBM PC BIOS has a bug fix for this chip. (2004-03-21)
Nokia 8210         
  • Nokia 8250's UI menu icon.
  • Nokia 8210
CELL PHONE MODEL
Nokia 8250; Nokia 8290; Nokia 8210i; Nokia 8260; Nokia 8265; Nokia 8265i; Nokia 8270
Nokia 8210 is a mobile phone by Nokia, announced on 8 October 1999 in Paris. At the time, it was the smallest, lightest Nokia mobile phone on the market, thus its selling point was based on its design and customization, with removable Xpress-on covers.
NCR Corporation         
  • 1913 National cash register on display at the Larimore Community Museum in Larimore, North Dakota
  • NCR model 3000 class 3434 computer
  • National cash register from the end of the 19th century, National History Museum, Sofia
  • WWII NCR poster
AMERICAN SOFTWARE, CONSULTING AND TECHNOLOGY COMPANY
National Cash Register Corporation; National Cash Register; National Cash Register Company; N.C.R Corporation; 4Front Technologies; NCR Self-Service; Kinetics, a subsidiary of NCR; NCR Corp.; AT&T GIS; At&t gis; NCR 5xxx; National Cash Register Co.; Kinetics (company); The NCR Corporation; Ncr corp; NCR corp; NCR Corp; NCR 8200; NCR 8250; NCR 7200; NCR 8500; NCR 7500; NCR Century 8200; NCR Criterion 8500; NCR 8550; NCR Criterion 8550; NCR 8570; NCR Criterion 8570; NCR 7200 model I; NCR 7510; NCR 7520; NCR 7530; NCR 7510 Basic +6; NCR 7520 Basic +6; NCR 7530 Basic +6; NCR 7200 model IV; NCR 7200 model VI; NCR 8100; NCR 8130; NCR 8150; NCR I-8130; NCR I-8150; NCR I 8130; NCR I 8150; NCR I-8100; NCR I 8100; NCR T-8100; NCR 1-8100; History of NCR Corporation; National Cash Registers; NCR (company); Ncr Corp; NCR Inc.; National Cash Registor Company; NCR Tower; Stanley C. Allyn; User:Joe Poolman/sandbox; NCR Electronics
<company> Electronics company mainly active in the midrange server market. NCR was founded 1884 as National Cash Register Company. It joint the computer industry in th 1950s. In 1991 it was absorbed by AT&T (see dinosaurs mating), only to be spat out again in 1996. NCR mainframes of the 1960's are remembered by some for their hardware incompatibility with IBM mainframes: NCR punched round holes in their punched cards while IBM punched rectangular ones. The codes and machines were not compatible and information could not be easily shared between NCR and IBM customers. http://ncr.com/. (1997-03-10)

ويكيبيديا

8250 UART

The 8250 UART (universal asynchronous receiver-transmitter) is an integrated circuit designed for implementing the interface for serial communications. The part was originally manufactured by the National Semiconductor Corporation. It was commonly used in PCs and related equipment such as printers or modems. The 8250 included an on-chip programmable bit rate generator, allowing use for both common and special-purpose bit rates which could be accurately derived from an arbitrary crystal oscillator reference frequency.

The chip designations carry suffix letters for later versions of the same chip series. For example, the original 8250 was soon followed by the 8250A and 8250B versions that corrected some bugs. In particular, the original 8250 could repeat transmission of a character if the CTS line was asserted asynchronously during the first transmission attempt.

Due to the high demand, other manufacturers soon began offering compatible chips. Western Digital offered WD8250 chip under Async Communications Interface Adapter (ACIA) and Async Communications Element (ACE) names.

The 16450(A) UART, commonly used in IBM PC/AT-series computers, improved on the 8250 by permitting higher serial line speeds.

With the introduction of multitasking operating systems on PC hardware, such as OS/2, Windows NT or various flavours of UNIX, the short time available to serve character-by-character interrupt requests became a problem, therefore the IBM PS/2 serial ports introduced the 16550(A) UARTs that had a built-in 16 byte FIFO or buffer memory to collect incoming characters.

Later models added larger memories, supported higher speeds, combined multiple ports on one chip and finally became part of the now-common Super I/O circuits combining most input/output logic on a PC motherboard.