The V86 return path is one of the longest microcode sequences in the 386. It pops nine DWORDs from the stack -- EIP, CS, EFLAGS, ESP, SS, ES, DS, FS, GS -- compared to three for a normal IRET. The microcode then sets up fixed access rights for every segment register:
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Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.