Is there any fairly easy way to get a tv test pattern on my tv screen?

Not the color bands but the circle.

The vertical doesn't seem linear.

It has a built in VCR and I have a DVD player. And a computer, and a
long term plan to take the output of my computer and put it into my
televisions. The plan hasn't even been designed yet, but if this is
the only way to get the test pattern, maybe that will spur me on.

The tv is about 5 or 10 years old. If it really is not linear, are
there still controls to adjust that? I know there arent' on the
outside, but maybe inside?? It's a 12 inch Magnavox with a built-in
VCR. I can get the model if it makes a difference.

Strangely enough, the parts that are inconsistent vertically seem to
be different depending what is on the screen, even though I never see
any movement in the picture. Maybe I'm going crazy so I'd like to
know, even if I can't readjust the vertical.