From:	cs AT vums DOT cz
Newsgroups:	comp.os.msdos.djgpp
Subject:	Interrupt enable
Date:	Tue, 20 Jun 2000 13:38:23 GMT
Organization:	Deja.com - Before you buy.
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To:	djgpp AT delorie DOT com
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Could you help me?

The following program (Borland C 3.1) works incorrectly on one
suspicious computer only:

main(void)
  { ...
    setvect(8,Timer);    // store to interrupt routine
    ...
  }

void interrupt Timer(void)
  { ...
    outport(0x20,0x20);  // enable interrupt (work incorrectly)
  }

On the other computers the program works correctly.
The suspicious computer parameters: 486DX4 AMIBIOS 1994. Include PCI
and  ISA bus, PCI VGA and MS DOS 6.22. Other orograms runs on this
computer correctly.
Questions:
1. Is  the statement (enable interrupt) "outport(0x20,0x20)" correct ?
2. How  to solve a such problem ?

Thanks Karel


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