they used
to come with wall warts and now come with tiny little
bricks with a mains-cord socket rather than mains prongs instead.
They appear to be switchers, which has good sides and bad sides....
You may find
those SMPSU blocks will work from either 115V or 230V
mains with [no] user adjustments.
They're marked that way, certainly: "110-240VAC 50/60Hz". That's one
reason I suspect them of being switchers.
Of course in general SMPSUs are lighter than linear supplies of the same
output power. So if these brickes seem light, they're probably switchers.
I assume the input connector on the SMPSU is
either an IEC plug or
one of those figure-of-8 connectors, or at least something stnadard.
Figure-of-8? I suspect you're probably talking about the same thing,
even though it doesn't quite look like most fonts' 8 to me. Here's a
'Figure of 8' is the common (although incorrect for many reasons) name
for the normal 2 pin main connector you find (found?) on cassette
recorders, radios, etc in the 1980s. I've seen it caleld a 'Telefunken
connector', although I suspect that name is dubious too.
-tony