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Built-in Check Definition |
The information in this document applies to:
WordPerfect® 5.1 for DOS
Problem
Solutions: Built-in Check: Built-in checks should be taken advantage of and not duplicated by wired, programmed, or manual controls. They function as a result of internal machine circuitry and are, therefore, performed automatically. Some of these checks are common to all machines. For example, all machines have checks which stop the machine for a timing error, a blown fuse, or an operation that is impossible or in conflict with another. Computers utilize input/output checks, instruction checks, and parity checks. The input checks ensures that all data is read and coded correctly into machine language; the output check ensures that the output characters are correctly set up for punching and printing. The instruction check permits the execution of only those instructions having a valid operation code and instruction format. The parity check verifies each character in the computer on the basis of an odd or even bit configuration. To ensure accuracy in disk-storage write operations, internal circuitry automatically compares the written record against the one from which it was written, or requires that a compare instruction doing this to be executed before another disk-storage operation. In magnetic-tape operations, each character and each channel within a record must pass a validity check for an odd or even number of bits; the system determines whether the bit count is odd or even. |
Answer:
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