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http://forums.nesdev.com/viewtopic.php?t=12654
[code]
F000 [........] (mask $F003)
*Puts the counter into load mode
F001 [VVVVVVVV] (mask $F001)
*Acknowledges interrupt
*If counter is in load mode, loads it with VVVVVVVV (otherwise do not modify its value)
F002 [........] (mask $F003)
*Puts the counter into clock mode
Counter operation:
* There is 8 bit latch that can be in LOAD or CLOCK mode.
* If it is in CLOCK mode and no interrupt is asserted, it is increased every 128th CPU clock
* If it overflows, IRQ is asserted and counter is stopped from furter increasing
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