lock_iom         1926 src/dps8/dps8_cpu.c         lock_iom();
lock_iom         1958 src/dps8/dps8_cpu.c             lock_iom();
lock_iom         3445 src/dps8/dps8_iom.c     lock_iom();
lock_iom         2256 src/dps8/dps8_scu.c         lock_iom ();
lock_iom          125 src/dps8/threadz.h void lock_iom (void);