OS/360 Introduction(PDF). IBM Systems Reference Library. IBM. 1972. s. 50–51. GC28-6534-3. «there are two configurations of the [OS/360] control program: ... MVT configuration»
System/360, Model 30 1401 Compatibility Feature(PDF). IBM. April 1964. A24-3255-1. «Mode status (System/360, Model 30, mode or 1401 compatibility mode) is set during the read-in of the compatibility initialization deck.»