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Intercept and Process the Timer Tick Interrupt

IP.com Disclosure Number: IPCOM000039717D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue


Related People

Cook, RL Morrill, DC [+details]


This article describes a technique which allows personal computer (PC) applications to share the timer tick interrupt call when executing concurrently. IBM PC technical references provide a technique that an application program can use to gain control on every timer interrupt. This technique is described under the heading "Interrupt Hex 1C - Timer Tick" and was designed for use when the PC is used for executing programs in a serial fashion. Many application programs were written according to this technique. The technique was introduced with the ability of having multiple application programs execute concurrently. At regular intervals, the technique will switch between the application programs which the user has running in the PC.