R_BX
push_word(emu, emu->x86.R_BX);
emu->x86.R_BX = pop_word(emu);
emu->x86.R_AX = emu->x86.R_BX;
emu->x86.R_BX = (uint16_t) tmp;
emu->x86.R_BX = fetch_word_imm(emu);
addr = (uint16_t) (emu->x86.R_BX + (uint8_t) emu->x86.R_AL);
return &emu->x86.R_BX;
offset = emu->x86.R_BX + emu->x86.R_SI;
offset = emu->x86.R_BX + emu->x86.R_DI;
offset = emu->x86.R_BX;