Q: Making a Checkerboard Pattern

For a detailed model I'm building I needed to simulate an 1890's linoleum
floor -- just a black & white checkerboard pattern of a specific size with
specific sized squares. Not knowing any better, I used Microsoft's Word to
create a table and applied fill patterns to the cells in a checkerboard
arrangement. Getting the desired sizes was very difficult because Work
likes to keep things in its own resolutions. Nevertheless, I finally
managed to get what I wanted but it was an experience I swore I'd never
repeat.

SO ... Since I couldn't think of any way to use Photoshop to do it at the
time, I didn't but the more I think about it the more I think it should be
possible. Unfortunately I know a lot more about Word than about PS so I'm
soliciting suggestions for creating a checkerboard pattern of a chosen size
in PS CS2 [or 5.5 if it's easier there].

TIA
Norm

.