mailbox_requests  352 src/dps8/dps8_dia.c     word36 mailbox_requests;
mailbox_requests  283 src/dps8/dps8_fnp2.h     word36 mailbox_requests;
mailbox_requests  121 src/dps8/dps8_fnp2_iomcmd.c     sim_printf ("mailbox_requests   %012llo\n", (long long unsigned int) mbx.mailbox_requests);