AT&T 6300/Olivetti M24 question

Does anyone have an Olivetti M24 or AT&T PC 6300 with the P8 version display card close at hand? The one I have has the display card very thorougly disabled (no I/O or memory space accessible) by the setting of a couple of jumpers and a jumper plug at position 5H on the display card. This is a 20-pin DIP socket and looks suspiciously similar to the 14 pin jumper plugr used to disable the P4 display card. Can anyone tell me what's supposed to be at this position? Since it's a 20 pin DIP, it could be a something simple such as an LS244, or (groan) it could be a PAL. On the P4, it's an LS00, but that's clearly not the case here. I have schematics for the P2 board, but not the P8. If all else fails, I'll take the board out and try to figure things out the hard way, but I'd rather get the information the easy way. --Chuck