Abstract: A dot matrix ink or bubble jet-type desktop printer is adapted to be connected to a personal computer by an RS-232 serial connector, and is able to simultaneously print on both sides of a sheet of paper. The double-sided printer includes a platen-less paper transport system which secures a sheet of paper to be printed in a substantially rigid plane with both sides of the paper exposed to printing. The paper transport system includes pick-up pinch roller assemblies arranged in contacting, opposed, counter rotating fashion, and tension roller assemblies, spaced-apart from the pinch roller assemblies which cooperate to define a substantially rigid plane between the sets of roller assemblies in which the paper is tensioned. Two print head carriage assemblies, each including a print head, are provided, in mirror-image relationship, on either side of the paper plane.