Soyo 5VD mobo

Hey all. I know this mobo is pretty old, BUT does anyone
still have one of these motherboards?

If anyone has one, the TAG RAM (which has UM61256AK-12)
on it, I take it this means its a 256k chip ? right?

Would this be the chip I would replace, if I wanted to up
the ram to 128mb? instead of 64mb? with a 512k TAG RAM chip?

Well it seems to be the only socketed chip on this motherboard.

Anyone know where I could find a 512k chip?

Any info appreciated

Cheers