IBM may be weak on innovation in its personal computer business, but it can’t be faulted on its tenacity. Admitting that it still hasn’t managed to set the portable and laptop world alight despite three bites at the cherry, it has commissioned IBM Japan to develop two new laptop computers. According to an informed source tapped by the Teleputing Hotline, both machines are improved versions of current PS/2 models – and one will be IBM’s first Unix laptop. The wire says that both will be supplied to IBM for worldwide distribution. IBM Japan is also designing a 2.5 Win chester to complement its 3.5 line.