The text read off it
[05.06.04]
A large section of core is reserved during the first two passes for text information (i.e. program instructions). It is only when this section cannot contain all the text information, that overflow text is written on SYSUT2 and SYSUT3. Also, it is more unlikely that SYSUT2 will be written upon than SYSUT3. For short programs, therefore, the only tape movement may occur on SYSLB1, SYSOU and the input tape (SYSIN or SYSUT1); and the loading process will appear to be a single pass operation.
C. Object-program execution
During the execution of an object-program, four different types of messages may appear on the on-line printer.
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IOCS tape switching and redundancy information.
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Items which are printed as the result of a source language 'DISPLAY' statement. The programmer may use this device to follow the flow of the object-program.
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'STOP' statements.
The STOP messages may be of two forms: a. STOP nnnnnn where nnnnnn is any number 6 digits or less. The computer will stop, and hitting the START key will cause the object program to continue in execution. (It is hoped that the programmer uses this instruction sparingly, if at all). b. STOP RUN
This message means that object-time processing of the job is completed and control has returned to the CTM supervisor.
The STOP messages will be accompanied by the source language statement number at which the STOP occurred, i.e. AT xxxxx,yy STOP nnnnnn where xxxxx,yy is the statement number.
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Object program error messages, usually concerning I/O errors. Object-time processing will terminate and control will revert back to the CT Monitor.
The Field Test version of the CT Processor will use the on-line printer for the DISPLAY, STOP statements, and object program error messages. (not SYSOU)
D. Subroutine Files Updater
The messages written on the on-line printer will be of two types:
- Messages concerning any I/O redundancy and tape switching information.
- A message signaling the successful or unsuccesful completion of the updating process.