From:	Skye <s_c AT iname DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Real mode ISR's
Date:	Sun, 13 Apr 1997 21:31:23 -0700
Organization:	Uniserve
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Message-ID:	<3351B31B.6C35@iname.com>
References:	<5iqtre$jt7 AT lion DOT cs DOT latrobe DOT edu DOT au>
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To:	djgpp AT delorie DOT com
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Gregary J Boyles wrote:
> 
> Which are the steps which need to be taken on entering and leaving an ISR?
> I can't find any info which will tell me and I am used to using the
> Borland key word 'interrupt'.
> 
> When using _go32_dpmi_allocate_dos_memory(...) I was going to enclose the
> ISR function and variables it uses inside two dummy functions and do
> pointer arithmetic to determine the size of the memory required. Is there
> any way of ensuring that gcc won't rearrange the variables or functions?

You might want to take a look at Shawn's Allegro code if you have it and
see how he manages it. I found it and the FAQ to be very good references
for this.

-SC

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