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From: nengle@copper.ucs.indiana.edu (nathan engle)
Newsgroups: comp.os.msdos.programmer
Subject: Re: I/O and Intel 8259A
Message-ID: <1991Apr8.132906.8392@bronze.ucs.indiana.edu>
Date: 8 Apr 91 13:29:06 GMT
References: <16410@chaph.usc.edu>
Sender: news@bronze.ucs.indiana.edu (USENET News System)
Organization: Indiana University, Bloomington
Lines: 40

In article <16410@chaph.usc.edu> syau@aludra.usc.edu (Shu-Jye Syau) writes:
>Hi :
>    I install a voice card in PC , when voice input , the ADC will interrupt
>8259A , and execute a interrupt handler to read in digital data from ADC .
>(hardware interrupt).
>
>    My problem is how can I get the interrupt number ?
>    I use TC 2.0 , setvect(intno,int_vect) .
>    
  You need to do a little reading and research. Somewhere in your manual
(or maybe even silkscreened on the voice card itself) there should be a
jumper block or setup option that says what IRQ level the voice card
generates for its ADC End-of-Conversion interrupt. My guess is that the
board defaults to either IRQ2 (for XTs), IRQ5 (for ATs), or IRQ3 (which
would work in either but would conflict with COM2 if it's installed.

  As hardware IRQ's come in through the 8259, it has been set up (and
this is standard for all IBM compatibles) so that the actual interrupt
generated is equal to the IRQ level + 8. Therefore IRQ2 comes in on
interrupt vector 0x0A (8 + 2), IRQ3 comes in as 0x0B, etc.

  So you need to find out what interrupt the voice card is using in
order to find out which interrupt vector to use.

>    The data inport address is 0x0394 .
>    Please help !!!!!

  The I/O address of a card like this almost never tells you which
interrupt it'll use. Standard cards like disk controllers and serial
ports have standard assignments that can clue you in on what IRQ they
should use, but voice cards just aren't common enough for this sort of
identification method.

>scott
>USC
>syau@aludra.usc.edu

Nathan Engle             Software Evangelist
Indiana University       Dept of Psychology
nengle@copper.ucs.indiana.edu