Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Intel 8253 and 8254 are Programmable Interval Timers, which perform timing and counting functions. They were primarily designed for the Intel 8080/8085-processors, but later used in x86-systems. They are found in all IBM PC compatibles. The 8253 was used in IBM PC compatibles since their introduction in 1981. In modern times, this PIT is not included as a separate chip in an x86 PC. Rather, its functionality is included as part of the motherboard's southbridge chipset. In some modern chipsets, this change may show up as measurable timing differences in accessing a PIT using the x86 I/O address space. Reads and writes to such a PIT's registers in the I/O address space may complete much faster.

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