On: Intel x86 documentation has more pages than the 65...

[FartyMcFarter]

There was no framebuffer in those consoles [1]. So you pretty much only have to store game state and some auxiliary data in those 128 bytes, which starts sounding a lot easier.

[1] https://en.wikipedia.org/wiki/Television_Interface_Adaptor

[jdblair → FartyMcFarter]

or, a lot harder, since your code can only draw a line a time, not work with the whole frame buffer!

[charcircuit → jdblair]

Modern games now have programmers deal with drawing a frame a pixel at a time when writing shaders. The GPUs themselves render a tile at a time and not the whole buffer.