Instructions Usable in Real/VM86 Mode
In addition to the 8086 instruction set, a VM86 task may utilize instructions that access the FS and GS data segment registers. Instructions may make use of the operand size override prefix to utilize 32-bit (rather than 8- or 16-bit) operands. The Intel® Software Developer's Manual Volume 3: System Programming Guide section on Virtual-8086 Mode provides a list of additional 286/386 instructions that may be executed in Real Mode or VM86 Mode (see Table 15-1 on page 373). It should be noted that, although the Intel® manual identifies this as a list of instructions introduced in the 286 and 386 processors, a number of the instructions listed were introduced in later processors.
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