Labels:book | box | bulletin board | dialog box | earth | hakham | laptop | plant | reckoner | sky OCR: Display Memory B800 B9000 B900 BY 100 B9002 Display Memory B800 B9000 B9001 1001 B900 Display Memory EC B800 B9000 B9001 1001 B9002 FIGURE 11.18 If the same value is xored twice with given byte of memory the effects of the first xor operation are can celled complerely and the hyte of memory shows 110 signs that either xor ever took place. (A The state of the before any xor operation performed. B The state of the PC after one xor is performed with xor es:[bx],al. Note that the bits ot B800 1001 that correspond to bits in AI arc flipped, whereas the bits of that memory loca tion that correspond 100 hits in AL remain unct hanged (C) The state of the PC after another xor es: [bx] ,al is performed. Again, the bits of B800: 1001 that correspond to bits in AL are flipped: the hits corresponding t ...
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