Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!cs4w+ From: cs4w+@andrew.cmu.edu (Charles William Swiger) Newsgroups: comp.sys.apple2 Subject: Disk // register listing Message-ID: Date: 2 Nov 90 17:12:29 GMT Organization: Carnegie Mellon, Pittsburgh, PA Lines: 12 Anybody have a detailed description of the $C0Ex range of addresses? (Which are the registers that control a 5.25" drive at the lowest level possible.) I've disassembled DOS 3.3 RWTS, the $C600 boot code, parts of ProDOS, etc and the function of some locations are obvious, but others aren't. Thanks. -- Charles William Swiger cs4w+@andrew.cmu.edu