This module provides a timed callback facility, similar to OS_CallEvery, but with a timing resolution limited only by the hardware in use.
Download HALTimer 0.04 (dated 01 March 2007)
HALTimer needs the HAL26 module to run, except under RISC OS 5. You download HAL26 from here.
HALTimer is fully RISC OS 4 and Iyonix compatible.