There are subtle differences with newer CPUs such as: the 8086 does not AND shift operands with 31 while the 80186 and newer do. Not sure if it matters much for

There are subtle differences with newer CPUs such as: the 8086 does not AND shift operands with 31 while the 80186 and newer do. Not sure if it matters much for compatibility, just some trivia. Source: 80186 hardware refence manual, appendix A "Differences between the 80186 family and 8086/8088"