If I can just find the right signal at a USB pin, then I'll be fine. I won't need the USB to parallel converter. (I would make up a connecting lead because I want to hold open the option of driving the camera from a computer with a parallel port still.)
But I suspect I don't understand how USB works. I'm from the olden days of parallel and serial ports which seemed to each have to be dedicated/specified - LPT1:, LPT2:, COM1: etc. Eg. I don't understand how one just plugs hubs and keyboards and things into one USB port and suddenly you have lots of USB ports!? Is it all to do with new-fangled modern intelligence - the software works out by itself where on all the USB ports to find the device it has to talk to - something to do with plug 'n play? Bring back the 5.25" floppy, that's what I say! And I had colour screens - you had a choice of green or orange!
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