INT 15H 5305H: CPU Idle

 Expects: AX    5305H
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 Returns: CY    clear (always succeeds)
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    Info: This function informs the BIOS that the system is currently idle
          and that processing should be suspended until the next system
          event (typically an interrupt) occurs.  The BIOS may then take
          action such as issuing a HLT opcode or slowing or stopping the
          CPU clock.

          You may access this service via INT 15H or by using the APM entry
          address obtained via INT 15H 5302H or INT 15H 5303H (protected
          mode connect).

See Also: APM API
          About APM
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