Question

write the different memory segment used in 8086 and their function?​

Answer 1

Answer:

The number of address lines in 8086 is 20, 8086 BIU will send 20bit address, so as to access one of the 1MB memory locations. The four segment registers actually contain the upper 16 bits of the starting addresses of the four memory segments of 64 KB each with which the 8086 is working at that instant of time.

Explanation:

A segment is a logical unit of memory that may be up to 64 kilobytes long. Each segment is made up of contiguous memory locations. It is an independent, separately addressable unit. Starting address will always be changing. It will not be fixed.

Note that the 8086 does not work the whole 1MB memory at any given time. However, it works only with four 64KB segments within the whole 1MB memory.

Below is the one way of positioning four 64 kilobyte segments within the 1M byte memory space of an 8086.