h6. [[Portable]] h6(. » [[Portable SWI Calls|SWI Calls]] h6((. » [[Portable_Speed2]] h6(((. » Portable_Speed2 5 h2. Portable_Speed2 5 h5. (SWI &42FCE) |_<^{width:4em}. Entry | | |<^. R0 |<^. 5 (Reason code) | |<^. R1 |<^. Speed index | |_<^{width:4em}. Exit | | |<^. R0 |<^. Corresponding MHz value | h4. Use The purpose of this call is to convert a speed index to a MHz clock rate. h4. Notes Due to hardware restrictions or for performance reasons, most systems will only support a limited number of CPU clock rates. This call, along with [[Portable_Speed2 4]] and [[Portable_Speed2 6]] allow the user to enumerate the list of available clock rates. Index 0 is always the slowest available speed, and (return value of [[Portable_Speed2 4]])-1 is always the highest available speed. To set the CPU speed, see [[Portable_Speed2 2]] or [[Portable_Speed2 8]] (to set the desired 'slow' and 'fast' speeds), and [[Portable_Speed]] (to switch between the configured 'slow' and 'fast' speeds). h4. See also * [[Portable_Speed]] * [[Portable_Speed2]] * [[Portable_Speed2 2]] * [[Portable_Speed2 4]] * [[Portable_Speed2 6]] * [[Portable_Speed2 8]] * [[Portable SWI Calls]]