Preliminary Specifications: Programmed Data Processor Model Three (Pdp-3)

Digital Equipment Corporation

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This addition is done in the 15 bit Index Adder using 1'scomplement arithmetic. If, after the addition, the sum is negative, theProgram Counter is advanced one extra position and the next instructionin the sequence is skipped. The contents of octal digits 0-5 of theindex register location are unaffected by this instruction.
_Skip on Positive index_ (10 usec. ) spx x Y Operation Code 44 The number in octal digits 7 through 11 of the instruction word is addedto the C(x). This addition is done... in the 15 bit Index Adder using 1'scomplement arithmetic.
If, after the addition, the sum is positive, the Program Counter isadvanced one extra position and the next instruction in the sequence isskipped. The contents of octal digits 0-5 of the index register locationare unaffected by this instruction.
_Load Index Register_ (10 usec. ) lir x Y Operation Code 14 The octal digits 7 through 11 (Y) of the instruction will replace thecorresponding digits of the memory register specified by x.

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