1 EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our reports included in this Form 10-K, into the Company's previously filed Registration Statements on Form S-8 Nos. 33-64481, 333-00405, 333-00403, 333-00349, 33-52620, 33-30099 and 33-36777. ARTHUR ANDERSEN LLP Dallas, Texas, April 1, 1996