palntsc/palntsc.c

/*---------------------------------------------------------------------------------


    simple pal/ntsc dectection demo
    -- alekmaul


---------------------------------------------------------------------------------*/
#include "palntsc.h"

//---------------------------------------------------------------------------------
// The NMI routine. Gets called 50 or 60 times per second 
// nothing to update for Input example
void nmi (void) {
}

//---------------------------------------------------------------------------------
void main (void) {
    // Put screen in text mode 2
    vdp_setmode2txt();
    
    // Put default char in VRAM and duplicate to all areas
    //  as we are going to write to line 10, it is in the second area
    vdp_setdefaultchar(FNTNORMAL);
    vdp_duplicatevram();
    vdp_fillvram(0x2000,0xf1,128*8); // Change color (or we will see nothing)
    vdp_enablescr();
    
    // Wait for nothing :P
    while(1) {
        // Update display with current value
        if (vid_freq==60)
            vdp_putstring(10,10,"NTSC CONSOLE");
        else if (vid_freq==50)
            vdp_putstring(10,10,"PAL CONSOLE");
        else {
            vdp_putstring(10,10,"UNKNOW");
        }
        
        // Wait Vblank
        vdp_waitvblank(1);
    }
    // startup module will issue a soft reboot if it comes here 
}