Re: asm and nasm newbie


"Zhang Huan" asked:

| ok, i know how to address in 16bit mode now

fine.

| another thing i'm curious to know is what's the 67h and 66h, seems to
| be the same code in different mode(16bit and 32bit). i have seen some
| people mentioned it, however i dont know what it means for

the prefix-bytes:

66h toggles* operand-size
67h toogles* addressing mode

*) use 'other than default' mode for only the following instruction.

But a few instructions are not too clear understandable with this:

66 e9 ... ;means a JMP by the opposite size (load IP or EIP)
66 c3 ;means RET by the opposite size (pop IP or EIP)
67 e0...e3 ;means LOOPx / J(E)CXZ by using cx or ecx as counters

and a few more ...

__
wolfgang


.

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