IBM 7128 DASD Expansion Unit
IBM 7128 feature allows the addition of five disk units to various system units and towers. It supports concurrent maintenance of these disk units. Maximums apply: Model 600: One in the base system unit, Model 620: One with processors #2175, #2179, #2180, Two with processors #2181, #2182, Model S10: One in the base system unit, Model S20: One with processor #2161, Two with processors #2163, #2165, #2166. Models 7xx: One with processor #2061, Two with processors #2062, #2063, #2064. Towers: One in #5033 Migration Tower, Two in #5034 and #5035 Migration Tower, Two in 5064/#9364 System Unit Expansion. For models: 600, 620, 720, 820, 830, S10, S20.