Getting home , I did what I always do when I run across something new to me, got on the computer and started searching for information on the adapter.
Found a few interesting things about them, and how to acquire them.
Getting a Famicom-to-NES adapter
If you have any FC games but no FC to play them on, you probably want to get an adapter to play them with.. unfortunately, they're not that easy to find. However, for some reason (probably due to being rushed for the holiday season of 1985), Nintendo made cart production easier by not making new NES cart boards, but by using the same Famicom cart boards and simply fitting Famicom-to-NES adapters on them! Weird, eh? Now, all you have to to is remove the adapter and you have your very own to use! Here's how to do it:
1. Gyromite, Excitebike, Stack-Up, Hogan's Alley, Urban Champion, or other old Nintendo-made cart. The cart should feel slightly heavier than a normal Game Pak; that's the tip-off that there's an adapter inside.
2. You need a special screwdriver to open Nintendo cartridges, a 3.8mm security screwdriver bit.
3. After the cart is opened, look inside. What you may see (if you were right about the cart being heaver) is a Famicom board.. attached to another board, with a 72-pin output. This is the Famicom-to-NES adapter!
4. To test for weight difference in cartridges and you can't do t by feel or don't have scales, make your own simple scale.
Two pieces of wood, one three or four inches wide, six inches long, the other piece being a small piece of doweling 1/4 inch by about 8 inches long.
Mark the center spot of the dowel, tie a string at the two ends of dowel, tie a cartridge to these strings, Hold the thick board upright, place the dowel with the center mark on the board, and if one cartridge heaver it will lower.
If it does lower, you have probably found your Famcon-NES adapter.
