Sega Enterprises Ltd’s Sega America Inc unit said it moved ahead of Nintendo Co Ltd in sales of 16-bit hardware: it said it captured 57% of these sales while Nintendo fell to 43% and that in November and December its Genesis game-playing system held 63% of the market while Nintendo’s comparable Nintendo Entertainment System had 37%; figures are from on a study by NPD Group Inc’s Toy Retail Sales Tracking Service and showed Sega held a 90% share of the CD-ROM video game category; it held a 48% dollar share to Nintendo’s 51% in the portable game category, but during the holiday season in 1993 Sega had a 57% share with Nintendo at 43%.