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back2root:ibm-pc-ms-dos:interrupts:int_1a:int_1a_00
Table des matières
INT 0x1A - 0x00 - Read System Clock Counter
Request/Call:
| reg | value | descr |
|---|---|---|
| AH | 0x00 |
Return:
| 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
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