Trailing-Edge
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PDP-10 Archives
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BB-BT99T-BB_1990
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10,7/system/cstart.hlp
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CSTART command
Function
The CSTART command begins executing the program from the
beginning, or from the address you specify in the command,
leaving your terminal at monitor level. The CSTART command is
the same as the START command, except that it leaves your
terminal at monitor level.
Format
CSTART addr
Where: addr is the address at which execution is to begin if
it is other than the location specified within the file
(.JBSA). If you do not specify an address, the
starting address comes from .JBSA (stored in the job
data area).
To use CSTART:
1. Use LOAD or GET to bring a program into memory.
2. Type one or two CTRL/Cs to halt your job with your
terminal at monitor level.
3. Type CSTART to begin running the program from the
beginning.
4. You can now type additional commands from your
terminal if they do not require core, or you can
detach your terminal from the job, using the DETACH
command.
Characteristics
Leaves your terminal at monitor level.
Requires core.
Restrictions
This command should not be used if your program requests input
from the terminal. This command is not available to batch users.
NOTE
The CSTART command allows the program to run from the
beginning or from the specified address. If the
program requires terminal I/O, the program will wait
until you access user level with the START or CONTINUE
commands. Then your terminal can accept output or
provide input.
Example
This is a program to find all the numbers up to 10,000.
.TYPE NUMBER.FOR<RET>
N = 0
100 N = N + 1
IF(N .EQ. 10000) GO TO 300
WRITE(22,201) N
GO TO 100
201 FORMAT(1X, I14, 'IS BETWEEN 1 AND 10000')
300 STOP 'DONE'
END
Execute the program.
.EXECUTE NUMBER.FOR<RET>
FORTRAN:NUMBER
NUMBER
LINK:LOADING
[LNKXCT NUMBER EXECUTION]
^C
^C
Type two CTRL/C's to halt the program.
Type CSTART.
.CSTART<RET>
Type CTRL/T for job status. CTRL/T does not echo on your
terminal.
DAY: :07:20 RUN: :01:00 RD:1093 WR:21 NUMBER 4+15P RN* PC000200
The status message RN* indicates the NUMBER program is running.
Detach from the job to do work on another job.
.DETACH<RET>
FROM JOB 19
.
.
.
Later, attach to your original job.
.ATTACH 19 [27,5434]<RET>
PASSWORD:<RET>
Type CONTINUE to return to user level. System message (see
NOTE).
.CONTINUE<RET>
?PLEASE TYPE ^C FIRST
Type CTRL/C and CONTINUE, to access user level.
.^C
.CONTINUE<RET>
DONE
END OF EXECUTION
CPU TIME:4:6.88 ELAPSED TIME:5:30.97
EXIT
.
Program message indicates execution is finished. The file
containing data from this program is named FOR22.DAT, and is
stored in your default disk area.
NOTE
It is necessary to type CTRL/C to re-enter user level,
because the program is running. The program must be
interrupted so that your terminal can access it.