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Copyright 1991 David Jurgens |
INT 1A,6 - Set Real Time Clock Alarm (XT 286,AT,PS/2)
AH = 06
CH = hours in BCD
CL = minutes in BCD
DH = seconds in BCD
on return:
CF = 1 if alarm already set or clock inoperable
- alarm setting is not relative like some sources claim, but the
actually clock time the interrupt should occur
- settings values must be in BCD
- when the alarm time is reached INT 4A is executed
- INT 4A vector should be replaced with address of the alarm
handling interrupt routine before setting the alarm
- INT 1A,7 should be called to disable the RTC alarm
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| Esc or Alt-X to exit |
int 1a,6 |
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