gtpo1m09 | Operations |
Introduction to TPF Operations
The TPF control program (CP) is main storage resident and cannot be directly controlled by a console operator. However, a number of file resident programs are available that allow you to communicate with the control program and direct its activities. Other programs are available for hardware manipulation. All of these file resident programs are collectively called command programs.
A certain amount of key data resides in the control program that is critical to system operation. This data is necessary during restart to ensure continuity of processing. Therefore, all changes are saved in file records known as keypoint records. During restart, these records are used to reinitialize the control program to its former state.
There are three phases associated with system initialization. The first phase concerns the initial loading of programs (IPL); the second phase concerns the startup or restart of the control program; the third phase concerns the reloading of programs if a catastrophic error occurs.