Programming aid for pocket calculators - uses card marked with key sequence for programme and placed on keyboard for entry using probe

摘要

A card that is laid on top of the input keyboard is proposed as a simple aid to the manual programming of pocket calculators. A card (5) of the same format as the calculator keyboard is marked to provide a flow chart of the programme required. Circles are drawn to correspond to keys and a number to correspond to the programme steps. Lines drawn between circles may be marked (11) to indicate repeated operations. Start and end addresses (A, E) are listed at top and bottom respectively. The card is placed on a transparent rigid plate with a matrix of holes that locates on the keyboard. A probe is inserted to operate the keys.