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1 NASA STANDARD >e 1 SPACECRAFT COMPUTER (NSSC-SI) 4 4 2 PRINCIPLES OF OPERATION 6 ' I Uncl A S 0252763 '- I;I"; 1 ENGRG NOTICE LTR Initial Release DESCRIPTION - a- YAIC , 2 / 1 5 / 77 nrr$$u*LU Errata Sheets 5/15/79 The attached pages are replacements or additions to the NSSC-I1 Principles of Operation. CONTR NO. NAS8-32808 INTE R NAT1ONA L BUS1NESS MACHIN ES CORP. FEDERAL SYSTEMS DIVISION PREPARATION GAITHERSBURG, MARYLAND NASA Standard Spacecraft Computer I1 (NSSC-11) Principles of Operation SIZE CODE IDENT NO, DWG NO. 7935402 I SCALE WT SHEET i TABLE OF CONTENTS (CONTINUED) d f Section Paragraph Title PaRe 7.4.4 Branch on Index High 88 7.4.5 Branch on Index Low o r Equal 89 7.4.6 Execute 89 7.4.6.1 Execute Exceptions 91 i 4 92 . ! VI11 STATUS SWITCHING 8.1 Program S t a t e s . 92 8.1.1 Problem S t a t e 92 8.1.2 Wait S t a t e 93 8.2 Protection 94 8.2.1 Area I d e n t i f i c a t i o n