Epson Apex 110 User's Manual And Diagnostics page 29

If your system has a hard disk, you need to prepare it before you can run
an operating system on it. Refer to "Using a hard disk drive" in Chapter 2
(and to your Diagnostics and MS-DOS manuals) for instructions on how to
prepare a hard disk for use.
If your hard disk has been properly prepared and set up to automatically
boot MS-DOS, the message above does not appear. Instead, the operating
system loads when you turn on the computer. The date and time prompts
display and then the system prompt:
C>
This indicates that the hard disk has been assigned as drive C.
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