typedef enum {BLACK     = 0x0,
      NAVY      = 0x1,
      GREEN     = 0x2,
      TEAL      = 0x3,
      MAROON    = 0x4,
      PURPLE    = 0x5,
      OLIVE     = 0x6,
      SILVER    = 0x7,
      GREY      = 0x8,
      BLUE      = 0x9,
      LIMEGREEN = 0xA,
      CYAN      = 0xB,
      RED       = 0xC,
      MAGENTA   = 0xD,
      YELLOW    = 0xE,
      WHITE     = 0xF} COLOR;

typedef unsigned char BYTE;
typedef unsigned int WORD;

#define PB_UP 0x1
#define PB_DOWN 0x2
#define PB_LEFT 0x4
#define PB_RIGHT 0x8
#define PB_ENTER 0x10

#define VGA_TEXT_PLANE 0x0000c000
#define VGA_COLOR_PLANE 0x0000e000

#define VGA_COLS 100
#define VGA_ROWS 75

#define LED_IO_PORT 0x80000040
#define BUTTON_PORT 0x80000041