My GetKey() won't work in text mode.

When I use GetKey() and press a key, nothing happens.

This code continually prints 0s no matter what I do.

Repeat 
Print GetKey()
Forever

The blitz docs example code won't display anything either. I just updated Blitz, so it should work. My waitkey dosn't work either.

However, if I enable graphics mode, they both work. Why?

EDIT:
KeyDown() won't work either.

Try this:

repeat

a=getkey()
if a<>0 then print a

until keydown(1)<>0
end

The console doesn't respond to key presses, except enter when the input command is called.

Use graphics mode for GetKey().

It's because there's nothing to slow it down. The GetKey() displays something, but it isn't on the screen for long enough to be rendered by the monitor. Through in a "delay 100" and you'll be able to see it.