The "cartridge days" is a very loose term. Nintendo 64 used cartridges and came out in 1996.

And lol, "there were no PCs", Atari came out in 1977. PCs have been around a lot longer than cartridge game consoles (NES was 1985). The internet also went live around 1983, so even that happened before the NES. Though public domain only happened in 1993.