Domanda

In 8086, 20-bit address is generated with two 16-bit registers by using segmentation. The first 16bit address is multiplied by 10 and the result will be added to second 16bit address. when multiplied by 10 it will generate a 5digit HEXA number which is 20bit long. where will this intermediate result of 20bit (obtained when multiplied by 10) be stored?

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Soluzione

Nowhere. The address appears on the corresponding pins (AD0-AD19) of the chip when it needs to access memory. The calculation is performed internally with dedicated logic. For example there is no actual multiplication by 0x10: the segment bits are directly paired to higher-numbered bits of the offset in corresponding adder (item 3 here).

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