问题
I wanted to create a small program in Assembly language, that delays for several seconds.
I am using Windows XP SP3, and opened a DOS window, and ran debug.exe
I entered there this short Assembly program:
MOV CX,3D
MOV DX,0900
MOV AH,86
INT 15
Function 86h in Interrupt 15h, performs a delay, and the Duration for the delay is in CX,DX, in MicroSeconds.
So If for example I want to delay for 4 seconds, then it's 4,000,000microseconds = 3D0900h, and that's what I put in CX,DX.
Running this short program, unfortunately does not perform any delay, it exits immediately.
I then tried another interrupt function:
Function number 0, in Interrupt 1Ah, returns the PC's clock count, to CX,DX. Each tick is 1/18.2 seconds.
I then entered and ran this short program:
MOV AH,0
INT 1A
But unfortunately, CX and DX both equal 0000h after running it.
Is there a reason why 2 Time related interrupts don't work in Windows? It seems that other interrupts do work..
Is there anything I can do to make them work, so I can achieve the small delay program that I want to write?
Thank you
回答1:
Omer, there's an excellent solution to your delaying problem that I found on CodeReview.
It uses the BIOS timer tick variable at address 0040h:006Ch directly rather than asking it's value through function 00h on int 1Ah.
Please take a look at https://codereview.stackexchange.com/questions/101035/a-low-tech-approach-to-measuring-game-speed
来源：https://stackoverflow.com/questions/29037461/time-related-interrupts-dont-work-in-assembly-in-windows