Debugging on IBM

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Debugging on IBM

Debugging interactive graphics programs on VM is very difficult, but by using two terminals it can be done more comfortably, and one can also use the interactive debugger. The procedure is as follows:

Login on the alphanumeric terminal as usual, then inform VM that the graphics output will be on another terminal by the command:
```
DEF GRAF 019 3270
```
(Where 019 is simply a free address.)
Then on the graphics terminal which probably has to be connected through index class 125, connect using the DIAL command:
```
DIAL userid
```

Now all alphanumeric i/o, debug commands and FORTRAN run time errors will be on the alpha terminal and only the graphics i/o on the DIALled terminal.

Janne Saarela
Mon Apr 3 17:00:12 METDST 1995