write_ind
#define write_xr(num, val) write_ind(num, val, 0x3d6, 0x3d7)
#define write_fr(num, val) write_ind(num, val, 0x3d0, 0x3d1)
#define write_cr(num, val) write_ind(num, val, 0x3d4, 0x3d5)
#define write_gr(num, val) write_ind(num, val, 0x3ce, 0x3cf)
#define write_sr(num, val) write_ind(num, val, 0x3c4, 0x3c5)
inb(0x3da); write_ind(num, val, 0x3c0, 0x3c0); \