Module card verification system

Claim 1

A tamper-proof document validator for comparing memorized coded information with a pre-set code on a pre-coded document, comprising a. a power source for providing a first potential; b. a manually operated code input means electrically connected with said power source for receiving memorized coded information corresponding in a predetermined manner with the pre-set code of said pre-coded document, said code input means including 1. a plurality of output contacts, and 2. a plurality of input switches manually adjustable to correspond with the memorized coded information code for applying said first potential to selected output contacts if and only if said switches are adjusted to correspond with the memorized code; c. modular validating circuit means connected with said power source for comparing the preset code of the document with the condition of said input switches to produce a first signal upon detecting a pre-determined correspondence between the adjustment of said input switches and the pre-set code of said pre-coded document and for producing a second signal upon detecting the lack of a pre-determined correspondence between the adjustment of said input switches and the pre-set code of said pre-coded document, said modular validating circuit means including 1. first and second sets of input contacTs adapted to be electrically connected with the pre-coded document and the output contacts of said manually operated code input means respectively, 2. a plurality of logic gates, each said gate having a pair of inputs, 3. a first set of conductors electrically connecting each said input contact of said first set of input contacts with one input of each said logic gate respectively, 4. a second set of conductors connecting each said input contact of said second set of input contacts with the other input of each said logic gate respectively, and 5. potting means for encompassing and integrating said logic gates and said first and second sets of conductors into a single replaceable modular structure, whereby the memorized coded information necessary for obtaining a first signal indicative of valid correspondence between a pre-coded document and manually entered memorized code information may be changed by replacing a modular validating circuit means having first and second sets of conductors arranged to interconnect different input contacts of said first and second sets of input contacts with said inputs of said logic gates.