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A memory control unit is described, which, operating in conjunction with a special purpose digital computer, achieves real-time storage into and retrieval from computer memory of individual video images undergoing on-line digitization, processing, and reconstitution. The memory control unit is capable of rapid sequential access on up to six 16 K-word core and two 131 K-word (28-bit word) solid-state memories, achieving data transfers to or from ememory at up to 40 million 9-bit samples/s for 33 ms. The memory control unit employs a variety of data rates, and can, under program control, assemble one or more bytes into, or disassemble one or more bytes from, each memory word. The control unit can sign extend incoming data to any of four different byte lengths from any of four different byte lengths. The control unit possesses dual data busses, one dedicated to memory read operations and a second capable of either "reads from" or "writes into" memory. The eight memory modules are sequenced by a small microprogrammed control store loadable from an associated computer.