endwise two sets of tabs 83 and 84 fig8 extend forwardly from the opposite ends of the cassette to cover the adjacent portions of the ribbon and thus protect the ribbon when handling the cassette out of the compartment 40 a second short bottom wall section 85 fig7 extends below the gear 80 to likewise protect the latter during handling of the cassette means are provided to effect reversal of the motor 21 when the print head 24 reaches the extremes of its travel and to properly locate the dot patterns forming the printed characters i e 86 fig1 across the paper strip 33 for this purpose a strip 87 of magnetic tape fig1 4 6 and 10 is extended across the path of a multi track magnetic read head 88 suitably attached to the underside of the print head 24 such head is of conventional construction having four spaced track reading sections 89 thereon the ends of the magnetic strip 87 are secured within slits 90 formed in arms 91 of a u shaped bracket 92 which is secured by screws 93 to the base 11 the arms 91 are somewhat flexible and thus maintain the strip 87 under constant tension and.