Controller for a storage device which allows either prestored or

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Details

395500, 364DIG1, 364243, 3642981, 3642628, G06F 1100

Patent

active

055353550

ABSTRACT:
A controller for a storage device allows either predefined firmware or user-defined firmware to be used. Initializing firmware is stored in a first memory, and is used to initialize the system. When a command is received, the user-defined firmware is checked before the original firmware to determine if the user has defined a more current version. If so, this user-defined firmware is used in place of the original firmware. The additional firmware can be changed in accordance with a special command which is different than the usual read/write command.

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Apple II Disk System Installation Guide Apple Computer Co., Oct. 1982.

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