AH = 00h: Read BIOS Time

• This function returns the number of BIOS clock ticks since midnight and the value in the RAM variable HOUR24. If the value returned for HOUR24 is non-zero, the application should increment the date by one day.
• Input: AH = 00h
• Output: AH = 00h
  [CX,DX] = BIOS "tick" count [HITIME,LOTIME]
  AL: HOUR24
  The RAM Variable HOUR24 is cleared.
  Carry Clear

• Error conditions: None
• Registers modified: AX, CX, DX, STATUS