ESC_SELECT_R
mode &= ~ESC_SELECT_R;
nexus->ID = ((mode & ESC_SELECT_R) ? 0xC0 : 0x80) | lun;
#define ESC_SELECT_RS (ESC_SELECT_R|ESC_SELECT_S)
#define ESC_SELECT_RI (ESC_SELECT_R|ESC_SELECT_I)
#define ESC_SELECT_RSI (ESC_SELECT_R|ESC_SELECT_S|ESC_SELECT_I)