National Convention (sign convention)
DS: SI
A FAR pointer or the Logical address at The Real address or segment descriptor specified by at The segment the Register (DS in the this Example) IS Combined with at The offset Contained in at The SECOND, the Register (SI in the this Example) to. form a real or virtual address. ( DS: SI points to address: the contents of the address in DS as the actual content of the SI + as an offset address).
名词缩写：
CPL current privilege level；
GPRs general-purpose registers；
MMX Multimedia Extensions, (64 bit, support integer and float pointing operations),x87 Floating-Point Programming—80-bit x87 registers and supports floating point;
operations on scalar data types.
SSE Streaming SIMD Extensions；