如何创建在16位MASM大会86休眠功能？ [英] How can I create a sleep function in 16bit MASM Assembly x86?

问题描述

我想创建16位MASM大会的x86睡眠/延迟过程，将，比如说，在屏幕上打印字符每500毫秒。
从我已经做了研究，似乎有三种方法来实现这一点 - 我想用使用CPU时钟周期一个

请注意我在Mac OS X雪豹运行Windows XP通过VMware Fusion的 - 我不知道这会影响什么。

。

可能有人请点我在正确的方向，或提供code我可以调整的工作一块？谢谢！

在code，我发现应该是打印'A'的屏幕每秒，但不工作（我想反正用毫秒）。

  TOP：
MOV AH，2C
INT 21
MOV BH，DH;卫生署当前的第二
GETSEC：;循环，直到目前的第二不等于最后，在波黑
MOV AH，2C
INT 21
CMP BH，DH;这里是退出循环和打印'A'的比较
JNE PRINTA
JMP GETSEC
PRINTA：
MOV AH，02
MOV DL，41
INT 21
JMP TOP
 

编辑：继GJ的建议，这里的工作程序。叫它

  DELAY PROC
 TIMER：
 MOV AH，00H
 INT 1AH
 CMP DX，WAIT_TIME
 JB TIMER
 ADD DX，3; 1-18，其中较小的速度更快，18接近1秒
 MOV WAIT_TIME，DX
 RET
DELAY ENDP
 

解决方案

其实你可以使用ROM BIOS中断为1Ah功能00H，读取当前时钟计数。或者你可以在地址$ 40读出DWORD：$ 6C，但你必须确保原子读。它是由MS-DOS在约18.2赫兹递增。欲了解更多信息，请阅读：的DOS时钟

I am trying to create a sleep/delay procedure in 16bit MASM Assembly x86 that will, say, print a character on the screen every 500ms. From the research I have done, it seems that there are three methods to achieve this - I would like to use the one that uses CPU clock ticks.

Please note I am running Windows XP through VMWare Fusion on Mac OS X Snow Leopard - I am not sure if that affects anything.

Could someone please point me in the right direction, or provide a working piece of code I can tweak? Thank you!

The code I have found is supposed to print 'A' on the screen every second, but does not work (I'd like to use milliseconds anyways).

TOP:
MOV AH,2C
INT 21
MOV BH,DH  ; DH has current second
GETSEC:      ; Loops until the current second is not equal to the last, in BH
MOV AH,2C
INT 21
CMP BH,DH  ; Here is the comparison to exit the loop and print 'A'
JNE PRINTA
JMP GETSEC
PRINTA:
MOV AH,02
MOV DL,41
INT 21
JMP TOP

EDIT: Following GJ's advice, here's a working procedure. Just call it

DELAY PROC
 TIMER:
 MOV     AH, 00H
 INT     1AH
 CMP     DX,WAIT_TIME
 JB      TIMER
 ADD     DX,3         ;1-18, where smaller is faster and 18 is close to 1 second
 MOV     WAIT_TIME,DX
 RET
DELAY ENDP

解决方案

Actually you can use ROM BIOS interrupt 1Ah function 00h, 'Read Current Clock Count'. Or you can read dword at address $40:$6C but you must ensure atomic read. It is incremented by MS-DOS at about 18.2 Hz. For more information read: The DOS Clock

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