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The clock rate of the PC's programmable interval timer which drives the speaker is fixed at 1,193,180 Hz, [3] and the product of the audio sample rate times the maximum DAC value must equal this. Typically, a 6-bit DAC [ 8 ] with a maximum value of 63 is used at a sample rate of 18,939.4 Hz, producing poor but recognizable audio.
In PC compatibles, Timer Channel 0 is assigned to IRQ-0 (the highest priority hardware interrupt). Timer Channel 1 is assigned to DRAM refresh (at least in early models before the 80386). Timer Channel 2 is assigned to the PC speaker. The Intel 82c54 (c for CMOS logic) variant handles up to 10 MHz clock signals. [1]
The "Bose Wave/PC" was released in 2001 as a device to play mp3 files and digital radio from a Windows PC. [13] [14] It was based on the Wave Radio, sent commands to the computer using a serial data cable and received audio via an analogue output from the computer's sound card. [15] Later models used a USB for transferring both commands and ...
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.
The PC-9800 series (Japanese: PC-9800シリーズ, Hepburn: Pī Shī Kyūsen Happyaku Shirīzu), commonly shortened to PC-98 or 98 (キューハチ, Kyū-hachi), [ 3 ] is a lineup of Japanese 16-bit and 32-bit personal computers manufactured by NEC from 1982 to 2000. The platform established NEC's dominance in the Japanese personal computer ...
A clock generator is an electronic oscillator that produces a clock signal for use in synchronizing a circuit's operation. The signal can range from a simple symmetrical square wave to more complex arrangements. The basic parts that all clock generators share are a resonant circuit and an amplifier. The resonant circuit is usually a quartz ...
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