The board is connected to J10, pad 15 (leads to R94 and R95, which i then lost under the sound chip), 13 (leads to C55), and 11/10 (which i believe is ground).
Yes, it's a video card, the 4 VRAMs are HM53461ZP-10 with 24 pins. Each has 64k words, each word is 4 bit. So i have 256k 4bit words or...