1 EXHIBIT 99.1 C.I.S. TECHNOLOGIES, INC. This Proxy is Solicited on Behalf of the Board of Directors The undersigned hereby appoints Philip D. Kurtz and Thomas G. Noulles, or either of them, each with full power of substitution, acting jointly or by either of them if only one be present and acting, attorneys and proxies to vote in the manner specified below (according to the number of shares which the undersigned would be entitled to cast if then personally present), all the shares of Common Stock of C.I.S. Technologies, Inc. ("CIS") held of record by the undersigned on April 25, 1996, at the Special Meeting of Stockholders to be held at 10:00 a.m., local time, on May 30, 1996, at the main office of CIS, located at 6100 South Yale Avenue, Suite 1900, Tulsa, Oklahoma, 74136 including any adjournments thereof. 1. To adopt the Merger Agreement and Plan of Merger, dated as of April 15, 1996 (the "Merger Agreement"), by and among CIS, National Data Corporation ("NDC") and NDC Merger Corp. ("Sub"), pursuant to which, among other matters, (a) CIS will merge with and into Sub (the "Merger") and (b) the shares of CIS Common Stock will be converted into the right to receive shares of NDC Common Stock, as described in the Proxy Statement/Prospectus dated May 1, 1996. FOR / / AGAINST / / ABSTAIN / / 2. In their discretion, to vote upon such other business as may properly come before the meeting. THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED FOR PROPOSAL 1 ABOVE. ------------------------------- Signature of Stockholder Date ------------------------------- Signature of Stockholder Date PLEASE SIGN THIS PROXY EXACTLY AS YOUR NAME OR NAMES APPEARS HEREON. IF STOCK IS HELD JOINTLY, SIGNATURES SHOULD APPEAR FOR BOTH NAMES. WHEN SIGNING AS AN ATTORNEY, EXECUTOR, ADMINISTRATOR, TRUSTEE, GUARDIAN OR CUSTODIAN, PLEASE INDICATE THE CAPACITY IN WHICH YOU ARE ACTING. IF A CORPORATION, PARTNERSHIP OR OTHER LEGAL ENTITY, PLEASE SIGN IN FULL NAME OR ENTITY BY AN AUTHORIZED OFFICER OR PERSON. Please fill in, date and sign the proxy and return it in the enclosed postpaid envelope.