## ALP Programming Guide and Reference

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### Protected Mode Exceptions

#GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment; the second operand must be a memory operand, not a register-if a register then #UD Fault; #GP(0) if a null selector is loaded into SS; #PF(fault-code) for a page fault; #AC for unaligned memory reference if the current privilege level is 3.