peek函数

如果用嵌C的汇编来写，该写怎么样的一段代码能替换peek和peekb函数？

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有汇编高手没？唉，找不到好点的汇编资料！
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unsigned npeekb(unsigned seg1, unsigned off1)
{
unsigned char c1,c2;

asm push ax
asm push ds
asm mov ds, seg1
asm mov di, off1
asm mov ax, ds:[di]
asm mov c1, ah
asm mov c2, al
asm pop ds
asm pop ax

return c1*256 + c2;
}

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