Interval timer

OSWord call Action Available on:
(dec) (hex)BBC Master Electron
3 03 Read interval timerx x x
4 04 Write interval timerx x x

This routine may be used to read/write the interval timer, used for events.

For read (OSWord 0x03) the current clock value will be writted to the 5 bytes pointed to by the XY registers.

For write (OSWord 0x04) the new clock value is contained in the 5 bytes pointed to by the XY registers.