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At this point, the PC-INCR wire goes high, followed briefly by PC-LD, which
causes the value of PC to be incremented by 1. This sets up the machine so
that the next instruction to be done will be the next one in sequence, at
the next word in memory. If the instruction is a jump of some type, the
value in PC will be completely overwritten later, so it doesn't hurt
to add 1 to the PC. This step is usually done in parallel with the next
step in order to save time by telescoping non-interfering actions together.
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