Sounds like the Atari VCS: Atari 2600 hardware - Wikipedia
128 bytes for everything, including CPU stack, frame buffer, sprites, game variables, etc. I've programmed some limited-resource systems in my time but I'm still amazed anybody managed to make games for the VCS.
Sure, Atmel makes ATtinys with only 64 bytes of RAM, but they don't normally get asked to do graphics and sound and manage multiple aliens.