Hi!
As you asked about Raspberry Pi: Those are a popular variant
of so-called single-board computers. In a way, they are a
by-product of smartphone technology. They combine a full
computer with USB, LAN and HDMI ports on a circuit board
the size of a smartphone. They do not have phone features.
You can get Raspbarry Pi and similar computers for less
than 100 USD depending on the variant and brand and they
are often used with variants of Linux. You can get those
pre-installed on SD-cards to plug into the Raspberry, or
install them using another computer.
In the case of that speech synthesizer, the idea is that
the Raspberry is a small, affordable complete computer,
so people probably made a pre-installed disk image with
a speech synthesizer for them. You can then connect the
Raspberry to your normal computer (for example by USB
or serial port, I would assume) and the Raspberry will
pretend being a hardware speech synthesizer. So you would
not have to treat the Raspberry like a full computer and
would not need to configure it, I guess.
Alternatively, people could make a pre-installed disk
image with DOS running inside dosemu2, dosbox or similar
emulators on the Raspberry itself, pre-connected to an
instance of some software speech synthesizer. Then you
would not even need a separate computer to run DOS.
Regards, Eric
PS: Regarding the Youtube, the installation of Mateusz'
DOS distro SvarDOS starts by speaking some description
of the speech feature after a silent boot phase, then
it speaks some install questions and the currently
highlighted menu items, but not the non-highlighted
ones. After "your computer will reboot now" etc, the
computer reboots and starts a long, silent process of
installing selected packages, showing a list of files
while extracting them. Speech only starts again when
all packages are installed. The DOS then announces it
will reboot to start the completely installed system.
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