The Commodore C-16 was basically a Plus/4-lite.
Or you could look at is as a pumped up VIC-20. Either way, it's tough to
find one today.
Owner Bob Bacus adds:
This computer is physically the same size as the
Vic-20 and C-64, but the circuit board on the inside
takes up much less space. I recall reading in an '84
issue of COMPUTE about the debut of this machine and
the Plus/4, and then never really hearing anything
else. It has a 40 column display like the C-64, but
if the display overscans your TV screen, you can
change it to 38 columns. The casette plug and two
joystick plugs are the same, and totally incompatible
with all pre-existing Commodore equipment. I have
read that the circuitry is compatible, so rigging up
an adaptor is possible (I have yet to try this,
however). Like the Plus/4, it has Basic 3.5, and
supposedly most programs written for the C-16 will
also run on a Plus/4 (yet another COMPUTE rumor). I
had doubts that this computer was ever really
produced, since I heard virtually nothing about it,
but I found this one in a consignment store for $10.
It seems to be a good improvement to the Vic-20, but
it's too bad I can't use my Vic casette drive...