Cisco Systems Inc has taken a stake of about 9% in Interlink Computer Sciences Inc, Fremont, California to seal a deal under which the two will adapt Cisco’s flagship Internetworking Operating System for the IBM Corp System/390 MVS mainframe environment. The planned IOS/390, intended to transform mainframes into mission-critical Internet and intranet servers, will eventually replace TCPaccess. Cisco acquired 622,000 new Interlink shares on undisclosed terms, and also bought product licenses for Interlink’s TCPaccess product suite. The two will jointly develop, market and support the proposed IOS/390 and IOS/390 applications. Several existing Interlink products, including TCPaccess, the TCPaccess-Fault Tolerant feature providing high-availability for network sessions, the Enterprise Print Services product for bi-directional printing, and the Harbor software distribution product, which automates delivery and synchronization of software.