Category : Utilities for DOS and Windows Machines
Archive   : IRQR.ZIP
Filename : IRQR.C

/*
IRQR -- Report status of IRQs in the H248 computer, PC/AT or compatibles.
Copyright 1988 by Lawrence R. Steeger

Based upon IRQS by Joseph Katz (Copyright 1988 by Joseph Katz), which
was published in Katz's "C Notes" in SEXTANT No. 34 - Late Spring 1988.

(Microsoft C Version 5)

*/

#include "stdio.h"
#include "conio.h"

#define NUMPORTS 2

typedef struct {
unsigned int number;
char* name;
} irqport;

unsigned int status,
bit,
p8259;

static irqport port[] = {{0x21,"0x21"},
{0xA1,"0xA1"}};

static char free[] = ">FREE",
used[] = " used";

static char* ibm[] = {"Timer",
"Keyboard",
"2nd 8259",
"COM2",
"COM1",
"LPT2",
"Floppy Disk",
"LPT1",
"Clock",
"Redirected IRQ2",
"(reserved)",
"(reserved)",
"(reserved)",
"Coprocessor",
"Hard Disk",
"(reserved)"};

static char* oem[] = {"",
"",
"Autofax Imager",
"",
"",
"MS Bus Mouse",
"",
"",
"",
"",
"",
"",
"",
"",
"",
""};

main()
{
puts("IRQR --\tReport Status of 8259 Hardware Interrupt Channels");
puts("\tCopyright 1988 by Lawrence R. Steeger\n");
puts("\t8259 IRQ Status IBM Assignments OEM Assignments");
puts("\t---- --- ------ --------------- ---------------");

/* display status of 8259 IRQs */

for (p8259 = 0; p8259 < NUMPORTS; p8259++) {

/* get 8259 status port information */

status = inp(port[p8259].number);

for (bit = 0; bit <= 7; bit++) {
printf("\t%-4s %3d %6s %-15s %s\n",
((bit == 0) ? port[p8259].name : ""),
(bit + (p8259 * 8)),
((status >> bit) & 1) ? free : used,
ibm[(bit + (p8259 * 8))], oem[(bit + (p8259 * 8))]);
}

if ((p8259 + 1) < NUMPORTS) puts("");
}

exit(0);
}

/* end of IRQR.C */