Noble, who tried to develop a new-style tape for the purpose, but without success. IBM Direct Access Storage Product Manager Alan Shugart assigned the job to David L. IBM also wanted inexpensive media that could be sent out to customers with software updates. The System/370 was IBM's first computer system family to make extensive usage of volatile read/write semiconductor memory for microcode, so for most models, whenever the power was turned on the microcode had to be loaded (System/370's predecessor, System/360, generally used non-volatile read-only memory for microcode). In 1967, IBM gave their San Jose, California storage development center a task to develop a reliable and inexpensive system for loading microcode into their System/370 mainframes in a process called Initial Control Program Load (ICPL). Drawings from IBM Floppy Disk Drive Patents
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