See http://www.garlic.com/~lynn/2003b.html: cp/67 wasn't the only alternative virtual memory system (to tss/360) built for the 360/67. univ. of michigan also built MTS (michigan terminal system) that supported virtual memory and paging on the 360/67.
See http://www.garlic.com/~lynn/93.html#15: I was also informed that LLMPS formed the original core/nucleus for the MTS system. Can anybody verify that?