The easiest thing to do is to simply use the current Hacking rules, but remove AR and make sure that Deckers have datajacks (or internal SatLinks) to access the networks. Once they're in, just run everything the same, except their meat body is knocked out while decking.
The difficult part is converting the old systems to the new notations. Use the System Design information in Unwired (p. 74-78) to get some ideas of how to re-configure the old systems to the new rules. (For instance, Zurich Orbital [p.78] has Firewall 9, Response 8, Signal 4, System 8; while Dante's Inferno [p. 77] has different ratings on their nodes, averaging around Firewall 4, Response 3, Signal 3, System 4)