GREG_HERCULESCOMPAT
vgaw(ba, GREG_HERCULESCOMPAT + ((ettype == DOMINO) ? 0x0fff : 0), 0x03);
vgaw(ba, GREG_HERCULESCOMPAT, 0x03);
vgaw(ba, GREG_HERCULESCOMPAT, 0x03);
bus_space_write_1(*iot, *ioh, GREG_HERCULESCOMPAT, 0x03);
bus_space_write_1(*iot, *ioh, GREG_HERCULESCOMPAT, 0x01);