초록 ▼

A mechanically programmable read only memory in the form of a card for use with a reading circuit to which the card is applied, an insulating substrate with a multiplicity of resistive coating strips arranged in a pattern on the face of a substrate, a multiplicity of circuit interrupters between cor

A mechanically programmable read only memory in the form of a card for use with a reading circuit to which the card is applied, an insulating substrate with a multiplicity of resistive coating strips arranged in a pattern on the face of a substrate, a multiplicity of circuit interrupters between corresponding ends of resistive strips and being removable along with any surface media applied thereover; conductor strips laid over the circuit interrupters and intersecting with the resistive strips for electrical connection therewith; additional conductor strips or bus strips applied on the substrate to intersect with the other ends of the resistive strips, all of the conductor strips having ends clustered at one edge of the substrate forming connector contacts for assembly with such reading circuitry; the resistive strips, circuit interrupters, and conductor strips being applied by screen printing technology; the circuit interrupters being formed of scratch off ink or mechanically abradable and removable ink; the conductor strips and resistive coating strips being respectively formed of low and high resistance inks; and a protective coating applied over the substrate and conductor strips, leaving windows for gaining access to the scratch off circuit interrupters.

대표청구항 ▼

A mechanically programmable read only memory for use with reading circuitry and comprising, an insulating substrate having a face and an edge portion, circuit interrupter means including a removable support area on the substrate, a plurality of resistors on the substrate adjacent the circuit interru

A mechanically programmable read only memory for use with reading circuitry and comprising, an insulating substrate having a face and an edge portion, circuit interrupter means including a removable support area on the substrate, a plurality of resistors on the substrate adjacent the circuit interrupter, each of the resistors having first and second connection ends, a conductor bus on the substrate and having a connector portion, the bus having connection with the first ends of said resistors, and a printed conductor on the substrate and traversing said support area, the printed conductor having spaced portions on opposite sides of the support area and respectively connected with the second ends of a pair of the resistors, the printed conductor having a connection portion adjacent one of the resistors, and the printed conductor being opened and disconnected with removal of said support area for disconnecting one of said resistors.