Date: Wed, 2 Dec 1998 10:52:45 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: 4pisecny AT fpv DOT umb DOT sk
cc: djgpp AT delorie DOT com
Subject: Re: timer interrupt handler
In-Reply-To: <199812011726.SAA18121@sparc.fpv.umb.sk>
Message-ID: <Pine.SUN.3.91.981202105141.24125K-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com


On Tue, 1 Dec 1998 4pisecny AT fpv DOT umb DOT sk wrote:

> When i set timer interrupt handler to my routine, i set his frequency to
> about 120Hz. It is my internal counter. Now i am counting how many times is
> called my new routine and in rquired intervals (in about 18.2Hz) i am
> calling original handler. I need this because it will turn off disks and set
> internal bios or dos timer. I have not found any chance to do this.

Since the original handler is a real-mode function that ends with an
IRET, you should use the library function
`__dpmi_simulate_real_mode_procedure_iret'.

Also, I suggest to look at the PCTIME package (the FAQ has the URL
where to find it in section 22.3), which has a working example of such
code.

> If you can and want answer, send me it as email to 4pisecny AT sparc DOT fpv DOT umb DOT sk

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