fnp_submailbox    359 src/dps8/dps8_dia.c     struct fnp_submailbox fnp_sub_mbxes [4];
fnp_submailbox    290 src/dps8/dps8_fnp2.h     struct fnp_submailbox fnp_sub_mbxes [4];
fnp_submailbox    301 src/dps8/dps8_fnp2.h #define FNP_SUB_MBX_SIZE        (sizeof (struct fnp_submailbox) / sizeof (word36))