== Timer Registers ==
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* 8253 /8254 Timer 0 Register (R/W)* 8253 /8254 Timer 1 Register (R/W)* 8253 /8254 Timer 2 Register (R/W)
These ports allow to access three decrementing 16bit timers. Assuming that the corresponding Control Registers are set to "LSB-then-MSB", the 16bit reload values (aka divider values) are written in two 8bit fractions: