I wrote some code for my custom ISA interface card. It has a 8 bit output 
mapped at 0x320.

When I run this code, I get "bus error (core dumped)"

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <curses.h>
#include <sys/types.h>
#include <machine/joystick.h>
#include <machine/pio.h>

#define DEVICE_0 "/dev/joy0"
#define DEVICE_1 "/dev/joy1"
#define EXIT_FAILURE -1

[...]

  /* Initialize Isa interface */
  baseaddr = 0x320;
  porta = baseaddr;
  portb = baseaddr + 1;
  portc = baseaddr + 2;
  contr = baseaddr + 3;

  /* put a high state on 8 pins of port A*/
  outb(baseaddr, 255);

[...]

What is wrong with this raw i/o ? What do I need ?


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