Strange Characters

Whenever I try to display characters on the screen not all of them will show up. Instead they are replaced by strange characters like in the provided picture. I have also provided the code that I am using to write the ttext to the screen. Any help would be appreciated.

#include 

#include 

#include 



#define W 136

#define H 96



TVout tv;

pollserial pserial;

char saveChar;

int index = 0;









void setup()  {

tv.begin(NTSC, W, H);

initOverlay();

tv.select_font(font6x8);

tv.fill(0);

randomSeed(analogRead(0));

tv.set_hbi_hook(pserial.begin(57600));





}



// Initialize ATMega registers for video overlay capability.

// Must be called after tv.begin().

void initOverlay() {

TCCR1A = 0;

// Enable timer1.  ICES0 is set to 0 for falling edge detection on input capture pin.

TCCR1B = _BV(CS10);



// Enable input capture interrupt

TIMSK1 |= _BV(ICIE1);



// Enable external interrupt INT0 on pin 2 with falling edge.

EIMSK = _BV(INT0);

EICRA = _BV(ISC11);

}



// Required to reset the scan line when the vertical sync occurs

ISR(INT0_vect) {

display.scanLine = 0;

}







void loop() {

if (pserial.available()) {

tv.print((char)pserial.read());

}

}