Time Sharing on a Computer with a Small Memory Techniques to make time sharing attractive on a computer with a small central memory are presented. "Small" is taken to mean that only one user program plus a monitor will fit into the memory at any time. The techniques depend on having two levels of secondary storage: level 1, several times larger than the main memory and quite fast; and level 2, many times larger and slower than level 1. CACM February, 1967 Fisher, R. O. Shepard, C. D. CA670201 JB February 28, 1978 4:10 PM 1642 5 1642 1642 5 1642 1642 5 1642