There was a basic programming cartridge for the Atari 2600. It was limited to programs that could fit on a single low-res screen (I think six lines?) and only a

There was a basic programming cartridge for the Atari 2600. It was limited to programs that could fit on a single low-res screen (I think six lines?) and only allowed one or two variables, if I recall correctly. I remember trying to write a simple program on a friend's Atari and found something that seemed really fundamental (maybe altering the value of an index variable in a for loop) was not allowed.