Disc System User Guide (1982).

2 Getting going
With the power turned off, connect the two cables from the disc drive to the
underside of the computer as shown in diagram 1. The plugs are designed so
that they will only fit one way. The plug on the power cable is shaped like a
rectangle with two adjacent corners cut off. DO NOT force it in the wrong
way round. Sometimes the plug on the ribbon cable has a lump on one side
which locates into a notch in the socket on the computer. However where this
aid is not present you may have to try both possible ways before you get it
right. When the drive is connected, turn on the power and press BREAK The
following message, or one very similar should appear on the screen:
BBC Computer
Acorn DFS
BASIC
>
This indicates that the disc filing system is installed and working O.K. Now
press SHIFT and BREAK holding both keys down together. The disc drive
motor will start turning for a couple of seconds and the red light on the front
of the drive will come on. This shows that the disc is properly connected and
working. If nothing happens, check the connections between the disc and
computer.
The foregoing assumes that the auto-start option has been set to work
when SHIFT is held down with BREAK. See Chapter 10.
Insert the utilities disc into drive 0. (With dual drives, drive 0 is the one
directly connected to the computer. See diagram 1, page 12). Press SHIFT and
BREAK again. This time the following message will appear on the screen:
Hello, this is the BBC microcomputer. This message was automatically loaded.
The utilities disc has three useful programs:
*FORM40 formats a 40 track disc
*FORM80 formats an 80 track disc
*VERIFY verifies a disc
These programs are used by typing their name.
There are also a number of demonstration programs on this disc.
Press SPACE to see them run.
This is an example of a !BOOT file which will be explained in
11