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The Intel 8253 PIT was the original timing device used on IBM PC compatibles.It used a 1.193182 MHz clock signal (one third of the color burst frequency used by NTSC, one twelfth of the system clock crystal oscillator, [1] therefore one quarter of the 4.77 MHz CPU clock) and contains three timers.
There is an additional PCLATH ("PC latch high") register which is only modified by software. Any operation which does not specify the full destination address (such as a 9-bit GOTO or an 8-bit write to the PCL register) fills in the additional high bits from the corresponding part of PCLATH.
A watchdog timer (WDT, or simply a watchdog), sometimes called a computer operating properly timer (COP timer), [1] is an electronic or software timer that is used to detect and recover from computer malfunctions. Watchdog timers are widely used in computers to facilitate automatic correction of temporary hardware faults, and to prevent errant ...
A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.
The Undocumented PC: A Programmer's Guide to I/O, CPUs, and Fixed Memory Areas (second, illustrated ed.). Addison-Wesley. ISBN 978-0-201-47950-8. Intel Corporation, "8253 Programmable Interval Timer", Intel 8080 Microcomputer Systems User's Manual, September 1975, page 5-169 from bitsaver.org in PDF
With the falling prices and widespread adoption of IP networking in the early 1990s, Acorn Universal Networking (AUN), [15] an implementation of Econet protocols and addressing over TCP/IP (in Acorn's words "an AUN network is a conformant TCP/IP network underneath the Econet-like veneer" [16]), was developed to provide legacy support for Econet on Ethernet-connected machines.
The High Precision Event Timer (HPET) is a hardware timer available in modern x86-compatible personal computers. Compared to older types of timers available in the x86 architecture, HPET allows more efficient processing of highly timing-sensitive applications, such as multimedia playback and OS task switching .
Evince (/ ˈ ɛ v ɪ n s /), also known as GNOME Document Viewer, is a free and open-source document viewer supporting many document file formats including PDF, PostScript, DjVu, TIFF, XPS and DVI. It is designed for the GNOME desktop environment. [3]