Answer Posted / x506
In 16-bit mode, the base register, EBX, acts as a general-purpose pointer. Besides the specialized ESI, EDI, and EBP registers, it is the only general-purpose register that can appear in a square-bracket memory access (For example, MOV [BX], AX). In the 32-bit world, however, any register may serve as a memory offset, so the base register is no longer special.
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