//video board opcodes
#define NOP     0x00
#define CLR     0x10
#define DISP    0x20
#define MODE    0x30
#define MENU    0x40
#define MENUS   0x50
#define CLRM    0x60
#define LOAD    0x70
#define SET     0x80
#define SLSET   0x90
#define SETSL   0xA0
#define BAD     0xB0

//definitions for notes
#define NoNote 0xF
#define lF 8
#define lG 7
#define A 6
#define B 5
#define C 4
#define D 3
#define E 2
#define hF 1
#define hG 0

//video board modes
#define FreeMode 1
#define SongMode 2