I had BASIC for the Atari 2600 (called Atari VCS at the time). It came with two controllers that had membrane keyboards. There were not enough keys for the alphabet so you had to use key modifiers to type the full A-Z and 0-9 character set. It was immensely tedious and really a bummer to use. I’m surprised you got far enough to do graphics with it. I dont recall being able to do anything except every simple text-based things like:

10 print “hello”

20 goto 10