Epson ActionNote 4SLC/25 User Manual page 31

If MS-DOS was loaded on your computer at the factory, the
computer starts up in MS-DOS as soon as it completes the
power-on diagnostics. The messages you see as the computer
loads MS-DOS depend on how your computer has been set up.
If you plan to use another operating system, you need to install
it now. See the documentation that came with your operating
system for installation instructions.
The procedures described in this manual assume you are using
MS-DOS. If you are using another operating system, see your
documentation for instructions on how to perform the various
procedures.
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Setting Up the Computer