Exhibit 11.1 STB SYSTEMS, INC. and SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON and COMMON EQUIVALENT SHARE (UNAUDITED) (IN THOUSANDS EXCEPT SHARE AND PER SHARE AMOUNTS) THREE MONTHS ENDED SIX MONTHS ENDED APRIL 30, APRIL 30, 1997 1996 1997 1996 --------- --------- --------- --------- Net income $ 2,418 $ 1,351 $ 4,670 $ 2,566 --------- --------- --------- --------- --------- --------- --------- --------- PRIMARY: Weighted average number of shares outstanding 4,554,885 4,500,000 4,534,533 4,500,000 Additional weighted average shares from assumed exercise of dilutive stock options, net of shares assumed to be repurchased with exercise proceeds 361,669 114 322,093 45 --------- --------- --------- --------- Net income per share $ 0.49 $ 0.30 $ 0.96 $ 0.57 --------- --------- --------- --------- --------- --------- --------- --------- FULLY DILUTIVE Weighted average number of shares outstanding Additional weighted average shares from assumed exercise of dilutive 4,554,885 4,500,000 4,534,533 4,500,000 stock options, net of shares assumed to be repurchased with exercise proceeds Net income per share 361,669 236 322,093 167 --------- --------- --------- --------- $ 0.49 $ 0.30 $ 0.96 $ 0.57 --------- --------- --------- --------- --------- --------- --------- ---------