A roll paper printer enables opening the cover and platen using a 4-part parallel linkage mechanism without interfering with the inkjet head. Air penetratable cartons containing perishable produce are stacked in rows along the length of the container to create a pair of supply air plenums running along each side wall of the container and a return air aisle running along the center of the container. The ATM cells output from each packet FIFO are written to corresponding one of a plurality of cell FIFOs.