As indicated in the discussion in the comments, we ARE talking about a specific thing here: not just ANY controller, but THE CLASSIC controller. The "classic controller" is a specific thing, or at least, a very specific type of thing.
True, you wouldn't say, "This fuel pump is for the diesel car." But you very well might say, "This fuel pump is for the 2015 Chevy Cruze."
Of course you would NOT say, "Mr Dealer, I'd like to buy the 2015 Chevy Cruze." You'd say "... a Chevy Cruze."
I think the difference is this: If we're talking about something as a specific type, we use "the", even if there are many of them in the world. If we're talking about one (non-specific) instance of the type, we use "a". (If we're talking about a specific instance of the type, we use "the" per the normal rules.)
(So actually in my car dealer example, if you just walked into a dealership looking for a car of this model, you'd say "a Chevy Cruze". You're talking about any car of that make and model. But if the dealer had shown you several different cars, and you have now made a choice, you might say, "I think I'll take THE Chevy Cruze." Meaning, the specific one that you showed me a little while ago, so now we're talking about one.)
So why not "the diesel car"? It's a type, isn't it? I can't say for sure, partly I'd just say it's the convention. But maybe it's too broad a type to "quality" for use of "the". In some contexts we might say "the diesel car". Namely, if we're explicitly contrasting it from other types of car. Like, "Things to consider when buying a car: The electric car is a relatively recent invention ... The diesel car is considered to be highly reliable", etc.
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Related: http://ell.stackexchange.com/a/17433/3281. (In this case, the reader knows "which kind" of controller the game requires--it's the Classic Controller.)
– Damkerng T. – 2015-04-09T14:03:18.753That's a good point. It seems that a very specific "kind" required though, as we don't say "this pump is for the diesel car". Presumably because there's still many kinds of diesel cars? – George T – 2015-04-09T14:15:38.817
I'd say it's more like it's because there are many kinds of cars. – Damkerng T. – 2015-04-09T14:17:07.603
Can you provide a link to an actual case you are talking about with regard to the? – None – 2015-04-09T14:53:43.077
1Also, it's interesting to note that the title to the JRR Tolkien series is The Lord of the Rings. Lotta song and book titles dispense with articles, though. Just like a lotta people dispense with the the in The Lord of the Rings. – None – 2015-04-09T14:55:07.717
@δοῦλος: I added a link. Regarding LotR, in that case "the" doesn't need a special rule as far as I can see. As Gandalf said, there is only one Lord of the Ring! – George T – 2015-04-09T15:02:58.253
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Your "generally" rule is just that – a general rule. In other contexts, other rules may apply.
– J.R. – 2015-04-09T15:34:16.887