\chapter{Introduction}

\thedos\ is a Disk Operating System (usually) bundled with the distribution of the \thismachine.

All \thedos-related features requires the DOS to be fully loaded.




\chapter{Bootstrapping}

\index{boot process}\thedos\ goes through follwing progress to deliver the \code{A:/} prompt:

\section{Probing Bootable Devices}
BIOS

\section{The Bootloader}
LOADBOOT

Then the Bootsector will try to read and execute \code{A:/tvdos/TVDOS.SYS}

\section{TVDOS.SYS}
\thedos.SYS will load system libraries and variables and then will try to run the boot script by executing \code{A:\\AUTOEXEC.BAT}

\section{AUTOEXEC.BAT}

AUTOEXEC can setup user-specific variables (e.g. keyboard layout) and launch the command shell of your choice, \code{COMMAND} is the most common shell.

Variables can be set or changed using \textbf{SET} commands.



\chapter{DOS Commands}


\chapter{DOS Libraries}

\section{Filesystem}

\index{filesystem (DOS)}Each port is assigned to different drive letters, and the device currently booted on is always drive \textbf{A}.

\section{The Filesystem Library}

\dosnamespaceis{Filesystem}{filesystem}

\begin{outline}
\1\textbf{open}(driveLetter: String, path: String, operationMode: String)
\\Opens a file on the specified drive.
 \2Operation Mode: \textbf{R} for read, \textbf{W} for overwrite, \textbf{A} for append
\1\textbf{readAll}(driveLetter: String)
\\Reads entire content of the file and return it as a string.
\1\textbf{write}(driveLetter: String, bytes: String)
\\Writes bytes onto the file opened for specified drive.
\1\textbf{isDirectory}(driveLetter: String)
\\Returns true if the file opened for the drive is a directory.
\1\textbf{mkDir}(driveLetter: String)
\\Creates a directory of opened path for the drive. Usage:
\\\code{filesystem.open("A", "path/to/nonexisting/directory", "W"); filesystem.mkDir("A")}
\1\textbf{touch}(driveLetter: String)
\\Updates a last-modified date of the opened file. If file does not exist, creates one.
\1\textbf{mkFile}(driveLetter: String)
\\Creates a file of opened path for the drive. Usage:
\\\code{filesystem.open("A", "path/to/nonexisting/file", "W"); filesystem.mkFile("A")}
\end{outline}



\section{The Input Library}

\dosnamespaceis{Input}{input}

\begin{outline}
\end{outline}



\section{The GL}

\dosnamespaceis{Graphics}{gl}

\begin{outline}
\end{outline}
