| 摘要 |
An OS module is plug compatible with a host computer preferably through its USB port. The module includes a data signal gate, a hardwire write control device, a first memory device, and a second memory device. The first memory device holds portions of an OS that are unchanged during startup and operation of the host computer, while the second memory device holds portions of the OS that may be changed during startup and operation of the host computer. These components are interconnected for data signal flow between the host computer and the second memory device through the data signal gate, while data signal flow from the computer for writing to the first memory device is functional only through the data signal gate and the write control device. The first memory device may be read without limitation.
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