Driver HRTPC uses the 8253 timer chip, channel 0, to read high resolution times. It assumes that the timer chip's reload value is set to 2¹⁶ and is running at 1.193 Mhz (the PC's default). Times can be measured with a resolution of 0.838 microseconds.

This driver cannot be used in APIC mode.

Requirements: 8253 timer chip at address 40h, interrupt controller 8059A at address 20h, timer generates IRQ 0. Incompatible with drivers CLKHRTPC and CLKPC.

Left High Resolution Timer

Driver HRTNULL

Down Driver CLKHRTPC