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To distinguish them from instructions carried over from S/360, the names of instructions essentially new with S/370 are shown in italics. Some machine This sample program is written entirely in IBM 370 Assembler. The program executes each of the problem-state, non-floating-point instructions in tion. The SET CLOCK instruction is executed only when the clock security switch on the operator intervention panel is set to permit changing the value ofA machine instruction is the symbolic representation of a machine language instruction of the following instruction sets: IBM System/370; IBM System/370 The 4th column (Format) is the format of the instruction as it would be written within an HLASM program. System/370 instructions; store status facility; integrated storage control for 3330- The Model 145 standard instruction set includes new general purpose. IBM System/370 ; Type, Register–Register Register–Memory Memory–Memory ; Encoding, Variable (2, 4 or 6 bytes long) ; Branching · Condition code, indexing, counting. One type of instruction, called “RS”, used for register–to–storage instructions. Such an instruction has source code of the form OP R1,R3,D2(B2). Such an