Abstract: A P.M. d.c. motor in which the permanent magnets thereof are provided as thin arcuate segments of predetermined length which rotate about a circular locus of core component defining poles. The paired permanent magnets are configured to slightly straddle the end surfaces of the core components as they pass thereover to effect a shear form of magnetic interaction with flux interaction regions or surfaces of the laminar core components. This serves to substantially minimize axially directed magnetic attractive forces including any time varying axial force terms which may be developed in consequence of commutation. Further a localize rotor balancing is achieved. A highly efficient core structure formed as a core base having outwardly extending legs which are bent perpendicularly upward to form upstanding core components is provided. Additionally, an aerodynamic seal is developed at the periphery of the rotor stator combination to provide for the isolation of any contaminants.

Abstract: Point of sale apparatus wherein a general purpose computer is utilized in emulating the functions of an integrated POS system. A general purpose computer is employed with a cash register specific keyboard to provide a broad range of computational and data handling capabilities for the apparatus. To perform in conjunction with the general purpose computer for its general computing function, a typewriter-type keyboard is employed with the apparatus. A prioritized protocol is developed between the two keyboard functions giving operational priority to the latter keyboard. To achieve a necessary reaction to cash register keying operations, a device driver program is positioned at a high priority level in the BIOS area of memory of the general computer to develop a vector interrupt deriving a jump address approach to the execution of cash register key function commands.