Labels:box | bulletin board | monitor | shelf | sky | slide projector OCR: Memory 20100 80286 20101 Bo 20102 05 moy ax.+ 20103 00 20104 sub On a branch to 20101 only one 20105 02 useful instruction byte fetched by the first instruction fetch after the branch, since the other byte in the word -aligned word that covers address 20 101 precedes the branch destination and therefore of no use as an instruction byte after the branch FIGURE 15.3 On the 80286, only one useful instruction byte is obtained hy the first instruction fetch after * branch to an ppo address The reason: a single word sized, word.: aligned instruction fetch that includes the byte at the branch target address would also fetch the byte before the branch target address That preceding byte useless, as it isn't part of the code that's about to be executed pord instructior exect uted
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