 However, due to the RAM prices in 1991, combined with its already high list price, the 170, like the 100 and 140, only had 2 megabytes (MB) RAM soldered directly onto the logicboard, which critics felt was restrictive for use with System 7.Further, since localized versions of System 7 were not yet available worldwide, the Japanese 6.0.7 KanjiTalk version of Apple's System software, was modified to support all three new PowerBooks and released as version J-6.0.7.1.As a result, this version was unofficially adapted for use with the standard 6.0.7 allowing many users to run System 6 on their PowerBooks, rather than upgrading on-board RAM with an expensive proprietary RAM card (a 6 MB card was US $899).