26 February 2021   Regarding GT-DOC (GTDOC.COM), to clarify what is on post #16, there is a file named "DIAGS" in the INDUSGTD.ATR file that does the same thing as the original GTDOC.COM.  The additional files in INDUSGTD.ATR includes Atari 800 Microsoft BASIC on the disk.  You must boot INDUSGTD.ATR and let it go into Microsoft BASIC for Atari 800 and then you can do the command:   RUN"D:DIAGS.* "   and the equivalent of GTDOC.COM will boot up.  Now you can choose