I own a Pioneer PX-7 and the PX-TB7 graphics tablet. The bit I'm missing is the Video Art cartridge to make the tablet usable. This cart is pretty much unobtainable (so far). Is anyone aware of a) any in existence that are purchasable or b) if a ROM image is available for it? I've not been able to find a ROM for it in the usual places. Any help, would be much appreciated.