IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Store Indicators (STI) (5010 Processor Module Model E only)0 15Op code R Level Mod11111 XX.X 00 XX 0000IIII II III IIIF 8-F 0-3 0The contents of the result, carry, and overflow indicators for the selected level replace thecontents of the register, on the current level, specified by the R field, or the accumulatorif R = 000. The level is selected by the binary encoded value in bits 8 through 11 of the instruction.The carry, overflow, and result indicators on the selected level are not changed. Theresult indicators on the current level are changed depending on the contents stored in thespecified register. The carry and overflow indicators on the current level are not changed.Status Register ContentsBit Contents0 Reserved1 Reserved2 Zero result indicator3 Negative result indicator4 Positive result indicator5 Even result indicator6 Carry indicator7 Overflow indicator8-15 ReservedExample:0 15STI instructionOp code R Level Mod1 1 1 1 1 1 1 0 0 0 1 0 0 0 0 0IIII II III Ill■■■•■,,,awww, ••■•••••■./.110..,F E 2 0Index register 60 15Status registerLevel 20 15STI instructionis fetched0 0 0 110 0 0 010 0 0 010 0 0 01 1 1 I 1 I 1 I 1 1 1 I 1 I 1 11111111M111\ _w ••■■■■••••.„,■••■••1 0 0 00 15 0 15After STIinstructionexecution 0 0 0 110 0 0 010 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 010 0 0 0 1 0 00 0111111111111111 111111111111111-,.••••■■,,■■•••' `....•••■••,,■■■.",••••■•••1 0 0 01 0 0 0Only bit 3 is on, so the negative result indicator is the only program indicator set on forlevel 2.4-48 GA34-0003