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>Any body know the reason for zeroing registers twice? I've seen it in theAccording to my memory, there was some computer that had two copies of
>few pieces of BAL I've ever tried to understand....
each register in hardware. SUB R1,R1 would subtract one copy from the
other. All instructions that stored into a register would store into
both copies. However, when the machine was powered up, there could be
garbage in the registers, and different garbage in the two copies.
The first zeroing only ensured that the same garbage was in both
copies. The second zeroing actually zeroed the register.
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