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In page CDC 6600:

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The CP has no explicit load and store instructions, and only jumps and the SAi instructions reference memory. An SAi instruction reads from central memory into an associated X register when i is 1-5 and writes from it when i is 6 or 7. Thus, in the CP, adding from memory would require two instructions. While slower in theory due to the additional instruction, the fact that in well-scheduled code, multiple instructions could be processing in parallel offloaded this expense. This simplification also forced programmers to be very aware of their memory accesses, and therefore code deliberately to reduce them as much as possible.[citation needed] The CDC 6600 CP, being a three-address machine, allows for the specification of all three operands.[1]