>>29
Because the former statement says the operating system in question is suitable only for minicomputers and is so inefficient that it makes the computer in question run like a 70s mainframe.
The latter statement says the operating system is written in assembly and designed for older computers.
Obviously these are not the same statement. Probably the poor author of the second was intending to say that the former statement refers to a version of Unix from 1988, and taking this statement as informative with regard to modern Unices is akin to treating the latter statement as one regarding Windows Vista. However the first statement
still holds true.