6 0 ). ▁CP - 4 0 ▁was ▁re im plement ed ▁for ▁the ▁S / 3 6 0 - 6 7 ▁as ▁CP - 6 7 , ▁and ▁by ▁April ▁ 1 9 6 7 , ▁both ▁versions ▁were ▁in ▁daily ▁production ▁use . ▁CP / C MS ▁was ▁made ▁generally ▁available ▁to ▁IBM ▁customers ▁in ▁source ▁code ▁form , ▁as ▁part ▁of ▁the ▁un supported ▁IBM ▁Type - III ▁Library , ▁in ▁ 1 9 6 8 . ▁ ▁Year ▁ 1 9 7 0 ▁▁ ▁IBM ▁announced ▁the ▁System / 3 7 0 ▁in ▁ 1 9 7 0 . ▁To ▁the ▁disappoint ment ▁of ▁CP / C MS ▁users ▁– ▁as ▁with ▁the ▁System / 3 6 0 ▁announ cement ▁– ▁the ▁series ▁would ▁not ▁include ▁virtual ▁memory . ▁In ▁ 1 9 7 2 , ▁IBM ▁changed ▁direction , ▁announ cing ▁that ▁the ▁option ▁would ▁be ▁made ▁available ▁on ▁all ▁S / 3 7 0 ▁models , ▁and ▁also ▁announ cing ▁several ▁virtual ▁storage ▁operating ▁systems , ▁including ▁VM / 3 7 0 . ▁By ▁the ▁mid - 1 9 7 0 s , ▁CP / C MS , ▁VM , ▁and ▁the ▁ma ver ick ▁V P / CSS ▁were ▁running ▁on ▁a ▁numerous ▁large ▁IBM ▁main frames . ▁By ▁the ▁late ▁ 8 0 s , ▁there ▁were ▁reported ▁to ▁be ▁more ▁VM ▁lic enses ▁than ▁M VS ▁lic enses . ▁ ▁Year ▁ 1 9 9 9 ▁▁ ▁On ▁February ▁ 8 , ▁ 1