SECTION 6
Conversions and Interfaces
PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide 6-117
INT 1Ah, Function AH = 09h: Read the Real-Time Clock Alarm
BIOS
Reads the alarm hour, alarm minute, and alarm second data and the AIE bit in
Register B from the CMOS RAM area of the MC 146818. This function must
wait for the updateĆinĆprogress bit to become zero and disable interrupts before
accessing the CMOS data.
On Entry:
AH = 09h
On Return:
If successful:
Carry = 0
CH = Hours in BCD (0ć23)
CL = Minutes in BCD (0ć59)
DH = Seconds in BCD (0ć59)
DL = 1 (Alarm enabled)
If NOT successful:
Carry = 0
DL = 0 (Alarm NOT enabled)
NPOWER Interfaces: INT 2Fh
These are NPOWER.EXEĆsupported interrupts.
INT 2Fh, Function AX = 5400h: Install Check
NPOWER
On Entry:
AH = 54h
AL = 00h
On Return:
AH = APM driver major version (BCD)
AL = APM driver minor version (BCD)
BX = 504Dh if NPOWER installed
Carry = 0 (Cleared)
6. Conversions and
Interfaces
