SECTION 6
Conversions and Interfaces
PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide 6-77
INT 15h, Function AX = 5305h: CPU Idle
NORAPM
An APM driver or powerĆaware application can use this call to reduce the power
consumed by the system. This call causes the system to halt the CPU and
reduce the clock frequency of the system until an interrupt occurs. Any interrupt
routine that generates I/O activity to one of the defined activity monitors or
issues an APM busy call causes the IDLE state to exit and return control to the
driver or powerĆaware application.
On Entry:
AH = 53h
AL = 05h
On Return:
If successful:
Carry = 0
If NOT successful:
Carry = 1
AH = Error code:
03h Interface not connected
09h Unrecognized device ID
INT 15h, Function AX = 5306h: CPU Busy
NORAPM
Informs APM BIOS system now busy, preventing system from entering Idle or
Suspend states and causing these state timers to reset.
System APM drivers or powerĆaware applications should call Busy during
processing not generating I/O activity to a defined activity monitor to prevent
slowdown of processing.
On Entry:
AH = 53h
AL = 06h
On Return:
If successful:
Carry = 0
If NOT successful:
Carry = 1
AH = Error code:
03h Interface not connected
09h Unrecognized device ID
6. Conversions and
Interfaces
