Int 1Ah, Clock Handler [+]; Use; Entry; Exit - Husky MP2500 Manual

30. INT 1AH, Clock Handler [+]

Use

Read or set time, date and alarm.

Entry

AH selects the function required, as follows. Other registers are used for
parameters.

Exit

AL, CX and DX are used to return results as described below.

Comments

IBM PC BIOS provides two functions:
00H Get system clock
01H Set system clock
The MP2500 BIOS provides identical functions and four extra IBM PC-AT
BIOS compatible functions to use the RTC:
02H Get RTC time
03H Set RTC time
04H Get RTC date
05H Set RTC date
It also provides four more functions to take advantage of the RTC's alarm
functions:
06H Set RTC alarm
07H Disable RTC alarm
09H Get RTC alarm and status
0BH Set system clock source
Chapter 30: INT 1AH, Clock Handler [+] 285