Date: Fri, 21 Sep 2001 10:11:06 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: djgpp AT delorie DOT com
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Subject: Re: interrupt handlers and VGA programming [OT]
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> From: (Moon)
> Newsgroups: comp.os.msdos.djgpp
> Date: Thu, 20 Sep 2001 21:25:46 GMT
> 
> I am writing a software in C under DOS that handles several hardware
> interrupts. Since functions that make DOS calls like "printf" cannot
> be used inside the interrupt handler, this is very difficult to debug.

You can use ScreenPutChar or ScreenPutString instead, the don't use
any interrupts.

> I have found out on the internet that some people use the command
> pokeb to display a number or a letter on the screen to make easier to
> understand what's going on with the code.
> 
> Unfortunately I haven't found the right parameters to use with pokeb.

The above functions already fogure that out for you, so just use
them.  Be sure to read their docs first, though.