Consider the similarities: All three computers have detachable, dual voltage, heavy-duty power supplies. All three computers accept internal hard drives. All three have built-in expansion slots. All three have internal boxer fans. All three have heavy-duty keyboards with integral numeric keypads. The Macintosh II is regularly matched to a 12- inch monochrome display. The Lisa/Mac XL is permanently matched to a 12-inch monochrome display. You could almost say that the philosophy has come full circle.
Appendix A-General Trouble Shooting