#include "portmap.h"
#include <stdint.h>

uint8_t scan(void) {

    uint8_t brk;

    static uint8_t key = 0;

    uint8_t scan = inb(0x60);

    brk = scan & 0x80;

    scan = scan & 0x7f;

    if (brk) {

         return key = 0;

    } else if (scan != key) {

         return key = scan;

    } else {

         return 0;

    }

}