I'm remembering a difference in the design of Commodore computers like the Vic and 64, versus the Atari 8-bits, and game consoles from the likes of Atari and Nintendo: they all had cartridge slots, but Commodore put them at the back instead of on top. From a technical perspective this was a minor difference, but it may have had consequences: one of the answers to Why did Commodore 64 cartridge games disappear? says
I used multiple Commodore 64s in the past, and I do not remember any of them ever having a cartridge slot. If any of them did, I never noticed them nor used them, and nobody I knew ever even mentioned anything about cartridges on their C64s.
Out of sight, out of mind?
Now I'm wondering why Commodore made that design decision. Aesthetics is always one possibility, but there is another that occurs to me: maybe it's just that it was a few cents cheaper to build that way. The company was certainly very focused on cost reduction.
Was it in fact cheaper to put the cartridge slot at the back?