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INT 0x1A - 0x00 - Read System Clock Counter


reg value descr
AH 0x00


reg descr
AL midnight flag
1 if 24 hours passed since reset
CX high order word of tick count
DX low order word of tick count

Notes & Comments

  • incremented approximately 18.206 times per second
  • at midnight CX:DX is zero
  • this function can be called in a program to assure the date is updated after midnight; this will avoid the passing two midnights date problem


back2root/ibm-pc-ms-dos/interrupts/int_1a/int_1a_00.txt · Dernière modification : 2023/01/17 21:56 de frater