EXHIBIT 11.1 EVANS & SUTHERLAND COMPUTER CORPORATION EARNINGS (LOSS) PER SHARE CALCULATION Unaudited (In thousands except per share amounts) Three Months Ended Nine Months Ended ---------------------------------------- ---------------------------------------- September 25, 1998 September 26,1997 September 25, 1998 September 26,1997 ------------------ ----------------- ------------------ ----------------- Basic Diluted Basic Diluted Basic Diluted Basic Diluted ------- ------- ------ ------- ------ ------- ------ ------ Common shares outstanding during the entire period 10,058 10,058 9,002 9,002 9,067 9,067 9,059 9,059 Weighted average common shares issued (repurchased) during the period, net (47) (47) 54 54 276 276 (12) (12) ------- ------- ------ ------- ------ ------- ------ ------ Weighted average number of common shares outstanding 10,011 10,011 9,056 9,056 9,343 9,343 9,047 9,047 Weighted average number of dilutive common equivalent shares outstanding - 879 - 541 - - - 430 ------- ------- ------ ------- ------ ------- ------ ------ Weighted average common and dilutive common equivalent shares outstanding 10,011 10,890 9,056 9,597 9,343 9,343 9,047 9,477 ======= ======= ====== ======= ====== ======= ====== ====== Net earnings (loss) applicable to common stock $510 $510 $3,825 $3,825 ($23,317) ($23,317) $7,211 $7,211 Net earnings (loss) per common and dilutive common equivalent share outstanding $0.05 $0.05 $0.42 $0.40 ($2.50) ($2.50) $0.80 $0.76