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82C54 CHMOS PROGRAMMABLE INTERVAL TIMER (1994-10)
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8253 functions, General overview (2002-08-04)
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8253 Timer Chip
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8253, 8254 Timer
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8253∕8253-5 Programmable Interval Timer (1986-11)
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8254 programmable interval timer (1993-09)
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Intel 8253 (Wikipedia) (2008-10-04)
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Programming the Intel 8253 Programmable Interval Timer by Mark Feldman