ocr: IS AS/400 HAVING A VIDRANGE CRISIS? 19941 ERP Market hare by Operating system avu Other OS 1690 Unix 44% DUURCE: AUVANCED MANUFACTORING KESEARCH Swing Shift. In the ERP arena, Unix surpassed OS/400 à in revcnuc share in 1994.AMR cites client/server support, third- party tools and better pricc/performance as reasons why.