From:	Eduardo TUDA Lorenzetti Pellini <dochell AT MailAndNews DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	RE: Basic IRQ mapping ... What am I doing wrong ?
Date:	Mon, 9 Apr 2001 19:19:12 -0400
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Thanks Eli,

>> I'm trying to hook a &^@&^#&^ IRQ with my DJGPP program.
>> I hate to post code on the newsgroup, but i don't have more options.
>> The program is running over plain DOS (IO.SYS, MSDOS.SYS and COMMAND.COM
>> ONLY).
>
>Are you sure this is plain DOS?  Does that machine has Windows
>installed?  If so, please describe how did you boot it into plain
>DOS.
>Also, what do you load in CONFIG.SYS and AUTOEXEC.BAT?

Yes, i'm sure it is a plain DOS: a boot disk with only IO.SYS, MSDOS.SYS and 
COMMAND.COM from the Windows 98 distribution (ripped the DRVSPACE.BIN)
There's no Autoexec.bat or Config.SYS (not even a SHELL=C:\COMMAND.COM 
blablablabla)

>Finally, are you using CWSDPMI as the DPMI server?  What version of
>CWSDPMI?
The last one, release 5 (according to my MANIFEST directory).

>What does it mean ``doesn't work''?  Does the counter in the interrupt
>routine stay at its zero value, or does something else go wrong?

Well, after the redirection of the ISR 8 routine, the program do not finnish 
!
The counter never arrives at the final value to trigger the rest of the code 
to finnish the program.
I expected to have the IRQ 0 ticking at 18.2 times/sec and my counter to be 
updated with that frequency... but nothing happens...
Do I need to reactivate the IRQ 0 generation on any system timer port inside 
my new ISR (for example, the IRQ is generated for the first time, the ISR 
needs to reactivate it again for the next loop and so on...)

>Hooking the protected-mode interrupt is all you need.  Hardware
>interrupts are always reflected to protected mode.
Ok... i was very confused after reading so many how-to's and comments over 
the 
NET.

>I don't see anything wrong in your code, except that I'd suggest to
>explicitly disable interrupts (with a call to disable()) before you
>call hookint in your main function, and then re-enable them with a
>call to enable().
I agree with you...
I will do that. 
I will try the modifications you suggested...

Thanks one more time my friend...

Eduardo TUDA DocHell Lorenzetti Pellin
PEA - Electrical Energy and Automation Department
USP - Politechnical School of Sao Paulo University - BRAZIL
http://www.pea.usp.br/~epellini
---------------------------------
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an open mind, and right to choose,
would you care to take a look,
or can you read me like a book...
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--------------------------------- (Up the Irons !!!)

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