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Editorial Team
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Asked: 2026-06-02T10:15:38+00:00

I would really appreciate if someone can explain to me what the : is

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I would really appreciate if someone can explain to me what the “:” is good for in jmp instruction, below is from wiki from wiki 

JMP 0x89AB, I know that this one is to jump to that position 
JMP 0xACDC:0x5578 what is that?
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  1. Editorial Team

    That is a far jump. It’s meaning differs between real and protected mode:

    • Real mode → it has a segment and an offset, the jump target is segment * 16 + offset.
    • Protected mode → it has a selector which points to a descriptor in either the GDT (global descriptor table, for the whole system) or LDT (local descriptor table, per process). The jump target depends on the descriptor type (and needs having sufficient privileges):
      • Code segment: it jumps to offset within the described segment.
      • Call gate, task gate, TSS: the offset is ignored, and the appropriate action is performed (e.g: a task switch).
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