I assume you're talking about the Atari 2600 console (VCS), which uses a limited version of that CPU, called 6507. It has the addressing space reduced to 16 KB.
This machine indeed has 128 bytes of RAM, but the code and data live on the cartridges, which can include up to 64 KB of ROM (exposing 4 KB at a time, with bank switching). Also, graphics is created on the fly ("racing the beam") at TV display, so there's no need to spend precious RAM on the framebuffer.
In comparison to the later constructions based on the 6502, like NES or C64, it was certainly not an easy platform to develop games, but not as hard as your comment is suggesting.
This machine indeed has 128 bytes of RAM, but the code and data live on the cartridges, which can include up to 64 KB of ROM (exposing 4 KB at a time, with bank switching). Also, graphics is created on the fly ("racing the beam") at TV display, so there's no need to spend precious RAM on the framebuffer.
In comparison to the later constructions based on the 6502, like NES or C64, it was certainly not an easy platform to develop games, but not as hard as your comment is suggesting.