ABBREVIATIONSADR address IPL initial program loadADDR address I/O input or outputASCP automatic system checkout program MAN manualCF console file MS main storageCaRR correction as operating systemCPU central processing unit PR-KB printer keyboardCTCA channel-to-channel adapter PSW program status wordCU control unit PWR powerDIAGN diagnostic REG registerDOS disk operating system REOD requiredEXE execute SDBO storage data bus-outIC instruction counter SEREP system error record editing programIMPL initial microprogram load SYS systemINTVN REOD intervention required SYS RES system residenceINVlD invalid TOD ClK time-of-day clock6