INT 1A - System and Real Time Clock BIOS Services

% For more informations, see the following topics:

~INT 1A,0~ Read system clock counter

~INT 1A,1~ Set system clock counter

~INT 1A,2~ Read real time clock time (AT,PS/2)

~INT 1A,3~ Set real time clock time (AT,PS/2)

~INT 1A,4~ Read real time clock date (AT,PS/2)

~INT 1A,5~ Set real time clock date (AT,PS/2)

~INT 1A,6~ Set real time clock alarm (AT,PS/2)

~INT 1A,7~ Reset real time clock alarm (PS/2)

~INT 1A,8~ Set RTC activated power on mode (convertible,PS/2)

~INT 1A,9~ Read RTC alarm time and status (convertible,PS/2)

~INT 1A,A~ Read system day counter (PS/2)

~INT 1A,B~ Set system day counter (PS/2)

~INT 1A,80~ Set up sound multiplexer (PCjr only)

- function is specified in register AH

- see ~RTC~