🚀 go-pugleaf

In order to redirect the output that goes to the screen, one should use
the command

  REWRITE ( OUTPUT, 'LST:' );

Note that the colon is absolutely necessary, otherwise, Personal Pascal
will open a file named LST. This is described on pages 6-124 to 6-129 of
the version 2 manual. In order to direct the output back to the screen,
one should use the command

  REWRITE ( OUTPUT, 'CON:' );

The manual does not say what will happen if you try 'lst:' instead of 'LST:'.


I don't know what happens when one tries to use the screen dump key sequence
from inside a pascal program. My best guess is that it probably will not
work. What you might try instead is calling the XBIOS routine SCRDMP. To
do this from Pascal, you will have to add the following lines to your program

  PROCEDURE SCRDMP;
    XBIOS ( 20 );

You could then access the screen dump by the command

  SCRDMP;

You will find the BIOS, XBIOS, and GEMDOS compiler directives described
on pages 8-1 to 8-15 of the version 2 manual. For the function numbers,
refer to a book like the Atari ST Internals from Abacus Software. There
are some other books on the market that will also document the routines
in the operating system, but I have not had any experience with them.
Like I said, I have never tried ALT-HELP from inside one of my programs,
so it may work. It's just out of my experience.

                                         Terry W. Reeves


Don't go near the operating system; it's a trap.