51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
|
|
#include <conio.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <peekpoke.h>
|
|
#include <string.h>
|
|
#include <c64.h>
|
|
#include <cbm_petscii_charmap.h>
|
|
|
|
#include "common.h"
|
|
//#link "common.c"
|
|
|
|
#include <6502.h>
|
|
#include <setjmp.h>
|
|
|
|
char interrupt_handler() {
|
|
// only needed if CIA interupts are still active
|
|
if (!(VIC.irr & VIC_IRR_IRST)) return IRQ_NOT_HANDLED;
|
|
// change colors so we can see where the IRQ fired
|
|
VIC.bgcolor0++;
|
|
VIC.bordercolor++;
|
|
// reading VIC.rasterline returns the current line
|
|
// setting it changes the line where the IRQ fires
|
|
if (VIC.rasterline >= 245) {
|
|
VIC.rasterline = 40;
|
|
} else {
|
|
VIC.rasterline = 245;
|
|
}
|
|
// acknowledge VIC raster interrupt (bit 0)
|
|
VIC.irr = 1;
|
|
// change colors back to where they were
|
|
VIC.bgcolor0--;
|
|
VIC.bordercolor--;
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void main(void) {
|
|
clrscr();
|
|
printf("\nHello World!\n");
|
|
|
|
// set interrupt routine
|
|
set_irq(interrupt_handler, (void*)0x9f00, 0x100);
|
|
|
|
// disable CIA interrupt, activate VIC interrupt
|
|
set_raster_irq(255);
|
|
|
|
while (1) {
|
|
printf("%d ", VIC.rasterline);
|
|
}
|
|
}
|