1 1 9.56.2.2 Register Names 1 ....................... 1 1 The registers are referred to with the letters assigned to them by 1 Zilog. In addition 'as' recognizes 'ixl' and 'ixh' as the least and 1 most significant octet in 'ix', and similarly 'iyl' and 'iyh' as parts 1 of 'iy'. 1