SECTION 6
Conversions and Interfaces
PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide 6-99
INT 15h, Function AX = 8300h: Set Event Wait Interval
BIOS
Programs the realĆtime clock to generate an interrupt after the specified amount
of time and bit 7 of the byte pointed at by ES:BX is set. The duration of the wait
interval is a multiple of 976 microseconds.
On Entry:
AH = 83h
AL = 00h
CX = High byte of interval in microseconds
DX = Low byte of interval in microseconds
ES:BX = Pointer to byte in calling program's memory with bit 7 set when
the interval expires
On Return:
If successful:
Carry = 0
AH = 0
AL = 0 = Function busy (Value written to CMOS RAM register B)
If NOT successful:
Carry = 1
AH = Error Code
AL = Undefined
INT 15h, Function AX = 8301h: Cancel Event Wait Interval
BIOS
On Entry:
AH = 83h
AL = 01h
On Return:
None
INT 15h, Function AH = 85h: System Request Key
BIOS
Called by INT 09h ISR when the SYS REQ key is pressed. The default BIOS
returns AH = 0 and carry clear.
On Entry:
AH = 85h
AL = 00 = Key make
01 = Key break
On Return:
If successful:
Carry = 0
AH = 0
If NOT successful:
Carry = 1
AH = Status
6. Conversions and
Interfaces