 propos feasibl program system thi paper propos design program facil involv digit comput program assist prepar larg-scale real-time program thi facil capabl prepar program varieti machin characterist facil's comput on basic assumpt random-access storag avoid necess segment construct program fashion trivial while assumpt unrealist intend provid opportun concentr aspect program construct the program system stress discoveri sourc program statement error attempt construct object program among comput characterist advoc program interrupt scheme larg set charact indirect address 