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Personally I don't see RS232 as outdated, it's just a very basic form of communication. I think it's still appropriate in many situations. I see it as sort of the no-thrills guaranteed communication method for low-bandwidth requirements.
To me, USB seems as overkill for something like telescope communications where the data throughput is so low but the overhead higher to build and run USB.
Parallel on the other hand, I see no need to continue utilising. I figure it was designed for higher bandwidth communication and now there are better higher bandwidth communication methods. What new products available do support it? Other than ToUCam's I'm not aware of any. Sure modified ToUCam's do use Parallel, but they're modified by people however they're able, so it makes sense there (if you want USB, someone's going to need to modify it for USB .... ).
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