Chapter 7: Core Software: OS, BASIC, DOS, Modem handlers

Core software: OS, BASIC, DOS, Modem handlers
7.1) What versions of the Atari Operating System (OS) are there?
7.2) What is the ATASCII character set?
7.3) What is Atari BASIC?
7.4) What are Atari DOS 1, DOS 2.0S, DOS 3, DOS 2.5, and DOS XE?
7.5) What are MyDOS, SpartaDOS, and other popular DOS versions?
7.6) How do I modify Atari DOS to support more than two drives?
7.7) Are there Graphical User Interfaces (GUIs) for the Atari?
7.8) What should I know about modem device handlers?