The Sun/4 was Sparc-based. I remember, because around 1990-91 I was in a department with a mix of Sun/3s and Sun/4s, and the incompatible CPUs were an occasion

The Sun/4 was Sparc-based. I remember, because around 1990-91 I was in a department with a mix of Sun/3s and Sun/4s, and the incompatible CPUs were an occasional spot of friction.