This document covers timing and related subjects on the IBM PC family under DOS. Subjects include BIOS and DOS functions, the BIOS tick count, hardware interrupts, timer tick interrupts, Port B, the 8253/8254 timer, speeding up the timer tick, dynamic tick periods, simulated vertical retrace interrupt, double and triple buffering, absolute timestamping, the RTC, other timing methods, reading the joystick, and PWM sound generation.
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