Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!ncar!gatech!udel!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!jh4o+ From: jh4o+@andrew.cmu.edu (Jeffrey T. Hutzelman) Newsgroups: comp.sys.apple2 Subject: Re: Softswitches and Rom Routines Message-ID: Date: 10 Feb 91 03:10:33 GMT References: <1991Feb7.165018.768@cunixf.cc.columbia.edu>, Organization: Carnegie Mellon, Pittsburgh, PA Lines: 15 In-Reply-To: The phrase "Disk Stepper Motor Phase 1 Low" refers to the method by which Apple 5.25" disk drives have been controlled since the original Apple ][ Disk Controller Card. If you look in the //c Ref. Manual (excellent, very complete reference to the machine, complete with firmware listings. I still ahve mine, even though I don't have the //c anymore), you'll find it referenced there as well. The reason it isn't mentioned in the others is that], as you may notice, it's in a hardware location assigned to a card. The same technique was used to control disk drives on the older //'s, but the hardware is on the disk controller, not in the machine. Thus, the reference manuals for the machines don't mention it. -------------------- Jeffrey Hutzelman America Online: JeffreyH11 Internet: jh4o+@andrew.cmu.edu BITNET: JHUTZ@DRYCAS >> Apple // Forever!!! <<