Just a PSA about carts in general...
If you do buy a repro, just be sure it's safe to use. A lot of them are using 3v parts in an unsafe way, which could potentially cause eventual damage to your console and the cart. This is a concern for not only bootleg/repro carts, but also homebrew and indie releases as well. There was an article a few years ago from db Electronics that got a lot of attention.
edit: Other concerns that got recent attention are gold fingers and beveled cart edges.
By "gold fingers," I mean the pins of the cart that get inserted into the console (the ones that have to be cleaned every so often). Legit carts have a hard gold plating, which stands up after many cycles of being inserted/ejected. A pirate or otherwise poorly designed cart is most likely to have an
ENIG finish to the fingers instead. ENIG is softer and less durable, and will show wear a lot sooner than hard gold. It isn't an issue that'll cause damage to your console, but if insert/eject the cart a lot then you will eventually wear out the ENIG finish which can cause issues with the cart being read.
As for beveled cart edges, the edge of the PCB that is being inserted into the console should be beveled. Typically, a PCB will have hard 90 degree edges. Beveling a cart edge is not something that every PCB manufacture offers, especially the cheaper ones that are only aimed at prototypes. And a pirate cart is very unlikely to spend extra money on a feature like beveled edges (or hard gold, or level shifters). The reason the cart edge should be beveled is so that when you insert it into the cart slot on the console, it kind of gently moves the pins of the cart slot out. When you insert a cart that has a hard 90 degree edge, it kind of smashes the pins. This can cause eventual damage, wearing out the cart slot making it harder to read carts.
I posted many times on this forum that you should NOT use the Sega Saturn Game Shark because it damages that Saturn's cart slot. Years ago, I read that the Game Shark PCB was too think and that's why it causes damage. Well as it turns out, the PCB is the correct thickness but the edge is not beveled. The Saturn's cart slot has MUCH thinner pins than a typical cart slot does, and inserting a cart without a beveled edge causes those fragile pins to wear out very quickly. This would eventually happen to any console, it would just take a little longer.
Here's some pics of a beveled cart edge, if you don't know what I mean...
Here's a related article from Retro RGB...
https://www.retrorgb.com/determining-th ... ridge.htmlTo sum up... If your cart has ENIG fingers, I wouldn't really be concerned if it's a cheap pirate cart. Just know that the more you insert/eject it the faster it'll wear out. But if it's a homebrew or indie release cart, you might have paid a little more money for it, it really should be hard gold. If the cart edge isn't beveled, that is a concern. While it wont immediately destroy your console's cart slot, repeated use will put unneeded stress on it and these consoles are old to begin with. If it's a pirate or bootleg cart, it's unlikely to have a beveled edge. It's easy to check, and easy to fix with a belt sander. If you don't have a belt sander, you might know someone that does. The most dangerous thing though is if the cart is using modern 3.3v parts incorrectly (old consoles typically supply 5 volts). This might be harder to figure out on your own, but you can always post a pic of the PCB if you want to find out.