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Clock rate or clock speed in computing typically refers to the frequency at which the clock generator of a processor can generate pulses used to synchronize the operations of its components. [1] It is used as an indicator of the processor's speed. Clock rate is measured in the SI unit of frequency hertz (Hz).
The mouse cursor was drawn on the screen by software, as were all other on-screen objects. To support real-time animation the screen timing PAL circuit would send a pulse to the 6522 once per vertical retrace. This was the basis for an operating system service called the VBL (vertical blanking) Manager. When the screen was to be redrawn, the ...
The No-Slot Clock, also known as the Dallas Smartwatch (DS1216E), [1] was a 28-pin chip-like device that could be used directly in any Apple II or Apple II compatible with a 28-pin ROM. Dallas Semiconductor produced the device as an easy implementation for a real-time clock for a variety of applications.
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Essentially a miniaturized Apple IIe computer on a card (using the Mega II chip from the Apple IIGS), it allowed the Macintosh to run 8-bit Apple IIe software through hardware emulation, with an option to run at roughly double the speed of the original IIe (about 1.8 MHz). However, the video output was emulated in software, and, depending on ...
The myth started around 1984 when comparing the Apple II with the IBM PC. [citation needed] The argument was that the IBM computer was five times faster than the Apple II, as its Intel 8088 processor had a clock speed roughly 4.7 times the clock speed of the MOS Technology 6502 used in the latter. However, what really matters is not how finely ...
When a program wants to time its own operation, it can use a function like the POSIX clock() function, which returns the CPU time used by the program. POSIX allows this clock to start at an arbitrary value, so to measure elapsed time, a program calls clock(), does some work, then calls clock() again. [1] The difference is the time needed to do ...
The Power Mac introduced a top clock speed of 2.5 GHz while liquid-cooled (eventually reaching as high as 2.7 GHz in April 2005). The iMac ran the front side bus at a third of the clock speed. Market demand was intense for a faster laptop CPU than the G4, but Apple never delivered a G5 series CPU in PowerBook laptops. The original 970 uses far ...