## ALP Programming Guide and Reference

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### Compatibility Note

The 16-bit forms of the SGDT and SIDT instruction are compatible with the Intel 286 processor, if the value in the upper eight bits is not referenced . The Intel 286 processor stores 1's in these upper bits, whereas the 32- bit processors store 0's if the operand-size attribute is 16 bits. These bits were specified as undefined by the SGDT and SIDT instructions in the 80286 Programming Reference Manual (Intel Order No. 210498).