This is the first I’ve seen this on eBay. There are a bunch of “conversion” cartridges, but they are all using custom PCBs. Here are a couple examples:
https://www.ebay.com/itm/BE-BLAZING...632450?hash=item4b565f4942:g:4qwAAOSw8PJb~X68
https://www.ebay.com/itm/IT-BEST3DC...136791?hash=item3641522657:g:k4MAAOSwLgpb~m0k
I already have a NEO-SD, but the Metal Slug cart would look pretty cool if I didn’t.
https://www.ebay.com/itm/BE-BLAZING...632450?hash=item4b565f4942:g:4qwAAOSw8PJb~X68
https://www.ebay.com/itm/IT-BEST3DC...136791?hash=item3641522657:g:k4MAAOSwLgpb~m0k
I already have a NEO-SD, but the Metal Slug cart would look pretty cool if I didn’t.