mailbox_requests  353 src/dps8/dps8_dia.c     word36 mailbox_requests;
mailbox_requests  280 src/dps8/dps8_fnp2.h     word36 mailbox_requests;
mailbox_requests  118 src/dps8/dps8_fnp2_iomcmd.c     sim_printf ("mailbox_requests   %012llo\n", (long long unsigned int) mbx.mailbox_requests);