From: "Tonu Aas" <tonu AT ids DOT ee>
Newsgroups: comp.os.msdos.programmer,comp.os.msdos,comp.os.msdos.djgpp,comp.os.msdos.misc
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Subject: Re: Control timing
Date: Fri, 2 Nov 2001 10:47:00 +0200
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

> That's mean i must install DOS on my PC. Can i use windows startup
> disk booting up, to make an environment as dos?

You can press F8 at startup time and select DOS mode. That all.

> Is that still same as dos box in win9x?
DOS box and DOS mode are not the same. Both of them are DOS 7 but
there are many differences.

> And if the new_timer(void) routine is too much coding, it can't finish
> the job when the next interrupt came expected. Do i need to set some
> interrupt masking flags?

No you dont. No interrupts are proccessed before you enable interrupts or
do iret. You interrupt code is short enough.

> > Windows 9x grabs all the interrupts, and lets dos programms 'use' them
at
> > random intervals.

Dont expect under DOS box that timer interrupt works as expected.
For example if you lose focus timer interrupt occurs once a second !!!

Tõnu.