Re: Delay problem

["Neato" <nocirckids@nocirc.org>]

BIOS int 15h provides a delay in microseconds.
put 86h in ah
convert 80us to hex; put high word in cx, low word in dx.
call int 15h

easy as that.

----- Original Message -----
From: Lionel Pinkhard <lionelp@worldonline.co.za>
To: <gameprogrammer@gameprogrammer.com>
Sent: Wednesday, January 02, 1980 9:01 AM
Subject: Delay problem


> Hey guys/gals,
>
> I'm having a little problem with some Macro Assembly coding, I'm trying to
> write a hardware detection routine, but for that I will need to create an
> 80 microsecond delay between two test routines, how would I do this in
> Assembly? Basically, this would be the same as 'usleep(80)' in C/C++, but
> I have never tried this in Assembly, sorry. My detection routine involves
> a timer, so this will have to be accurate. Otherwise, I would have been
> able to do this myself :-).
>
> My code goes something like this:
>
> code segment byte public
>
> assume cs:code, ds:code, es:code
>
> org 100h
>
> _detect:
>
> ; first test code
>
> ; here I want the 80ms delay
>
> ; second test code
>
> ; check hardware and return output
>
> mov ax, 4c00h
> int 21h
>
> stat1 db ? ; first test results
> stat2 db ? ; second test results
> ; messages for output
>
> code ends
>
> end _detect
>
> Well, I hope this is enough detail, I wouldn't want to elaborate too much,
> and waste bandwith! Basically, I just need the Asm equivalent of the
> 'usleep()' function.
>
> I really hope somebody can help me out!
>
> Ciao,
>
> Lionel
>
>
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