Abstract: Apparatus for accommodating a purchaser at a vendor's check-out station or the like with the check writer being provided with a communication line for validating and clearing checks, along with a register for determining the transaction total. The apparatus and system of the present invention further permits the purchaser/customer to insert a check blank from a personal checking account into the writer, and means are provided for printing appropriate indicia on the check blank, including date, payee, and amount of the check, and further having an opening for enabling the person to execute the already-imprinted check.