=> R0 = 3
R1 = pointer to five byte block
This SWI reads the interval timer. On exit, the buffer contains five byte interval timer, with LSB first.
The timer is incremented 100 times a second, and generates event 5 when it reaches 0. (You must enable the event with OS_Byte 14). To generate repeating events you would have to reload the timer on each event. The timer is obsolecent - use OS_CallAfter or OS_CallEvery instead.
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