Again for all the junk on the site gamefaqs has some gems. If you snap a photo of the port I can point you in the right direction but your almost certainly looking at Hercules or rgb. Hercules was a custom Cga/ega port and you'd want a vga plug on the other end. Matching the yy cc whatever it is. ;) Rgb is much easier matching 6 or 9 pins. You line up the wires for each colour and possibly ground (9) to analogue rca ports.
For Hercules check out the Tandy, commodore, and Atari computer threads. For rgb look at Dreamcast, GameCube, and Sony psx/ps1. The original ps1 second release model removed the composite cables and puts a custom (Sony video) vga port but the pins match most 9pin video out so you can use their pin settings. Left to right bottom to top on 9pin computer to left to right down/up V on the Sony. On the off chance it's actually vga the Dreamcast faqs, I don't remember which one, one has a vga to dvi-a pin out that you can use as a stepper or experiment with to skip a few steps.
Bottom line if you look up what the output colours and signals are on your computer, you can match it to an analogue adapter on anything modern. Any thrift shop or donation shop will sell you random cables for a dollar or two ! And no matter how rural you are look on Craig's list. Someone is always dumping a "mixed box of cables, free"!
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