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===VAL Operating System===
The controller has two levels or operation:
The controller has two levels or operation. The top level is called the VAL operating system, or monitor, because it administers operations of the system, including interaction with the user. The second level is used for diagnostic work on the controller hardware. The system monitor is a computer program stored VAL programmable read-only memory ([[Programmable read-only memory|PROM]]) in the Computer/Controller. PROM memory retains its contents finitely, and thus VAL is immediately available when the controller is switched on. The monitor is responsible for control of the robot, and its commands come from the manual control unit, the system terminal, or from programs. To increase its versatility and flexibility, the VAL monitor can perform of its commands even while a user program is being executed. Commands that can be processed in this way include those for controlling the status the system, defining robot locations, storing and retrieving information the floppy disk, and creating and editing robot control programs.▼
* the top level is called the VAL operating system, or monitor, because it administers operations of the system, including interaction with the user;
* the second level is used for diagnostic work on the controller hardware. The system monitor is a computer program stored VAL programmable read-only memory ([[Programmable read-only memory|PROM]]) in the Computer/Controller.<br>
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==References==
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