Epson EQUITY 3865X/20 PLUS - Manual (Page 85)

You can load MS-DOS from an application program diskette
if that diskette contains the operating system. See your
MS-DOS Reference Manual for information about creating a
system diskette.
Inserting and Removing Diskettes
If you have a diskette drive, insert a diskette as follows:
hold the diskette with the label facing up and the read/write slot
leading into the drive, as shown below.
I /
read/write s l o t
Slide the diskette into the slot until it is in all the way. Then
turn the latch down to lock it in a vertical position. This keeps
the diskette in place and allows the read/write heads in the
diskette drive to access the diskette.
When you want to remove a diskette, first make sure the disk
drive light is off. Then flip up the latch and carefully pull out
the diskette. Place it in its protective envelope and store it in a
proper location, such as a diskette container.
Using Your Computer 3-19