Both the 370/168 and the 370/158 had MP (multiprocessing) models that offered "tightly coupled multiprocessing [REF].
The optional IBM 7070/7074 Compatibility Feature allowed the 165 to "run 7070 and 7074 programs at speeds that, in general, equal or exceed those of the original systems"[REF] and yet "not affect normal operation of System/370."[REF][REF] .