lock_iom         1940 src/dps8/dps8_cpu.c         lock_iom();
lock_iom         1972 src/dps8/dps8_cpu.c             lock_iom();
lock_iom         3440 src/dps8/dps8_iom.c     lock_iom();
lock_iom         2293 src/dps8/dps8_scu.c         lock_iom ();
lock_iom          129 src/dps8/threadz.h void lock_iom (void);