HP Vectra Technical Reference Manual page 295

F1AL-SET__CLK--CNT (AH
=
01H)
Sets the count in the software clock. And resets the 24 hour overflow bit.
On Entry: AH
=
F1A..-SET__CLLCNT (01H)
CX
=
High word of Count.
DX
=
Low word of Count.
On Exit: No values returned.
Registers Altered: None
F1AL-GET_RTC (AH
=
02H)
Gets the time from the real-time clock.
On Entry: AH
=
F1A..-GET__RTC (02H)
On Exit: CH
=
Hours in BCD.
Cl
=
Minutes in BCD.
DH
=
Seconds in BCD.
Carry flag
=
1 if real-time clock is not operating.
Registers Altered: AH, CX, DH
F1AL-SET__RTC (AH
=
03H)
Sets the time of the real-time clock.
On Entry: AH
=
F1A..-SET__RTC (03H)
CH
=
Hours in BCD.
Cl
=
Minutes in BCD.
DH
=
Seconds in BCD.
DL
=
1 if daylight savings time option.
o
otherwise.
On Exit: No values returned.
Registers Altered: AH.
286 System Drivers