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In order to calculate the actual address, you multiply the segment part of the address by 16 (or shift it left by 4 bits...same thing), and then add the offset. When you're done, you have a 20-bit address.
In computer engineering and low-level programming (such as assembly language), an offset usually denotes the number of address locations added to a base address in order to get to a specific absolute address.
A offset is not an address but the (distance|id) of this Address from the start of a memory segment starting at 0 . An offset is also known as: an effective address. an address offset. It's the id of the address inside the memory segment.
14 lut 2023 · Effective address or Offset: An offset is determined by adding any combination of three address elements: displacement, base and index. Displacement: It is an 8 bit or 16 bit immediate value given in the instruction.
The segment:offset address is defined as the logical address, the actual physical address is calculated by shifting the segment address 4 bits to the left and adding the offset. The example given next shows that the actual address of 2F8 4:0532 is 2FD72h .
29 cze 2023 · Effective address or Offset: An offset is determined by adding any combination of three address elements: displacement, base and index. Displacement: It is an 8 bit or 16 bit immediate value given in the instruction.
The offset represents the distance, in bytes, of the label from the beginning of the data segment. In Protected mode, an offset is always 32 bits long. In Real-address mode, offsets are only 16 bits.
