Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!ccu.umanitoba.ca!herald.usask.ca!alberta!ubc-cs!van-bc!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu From: daveh@ccwf.cc.utexas.edu (David H. Huang) Newsgroups: comp.sys.apple2 Subject: Re: Softswitches and Rom Routines Message-ID: <43942@ut-emx.uucp> Date: 9 Feb 91 07:04:19 GMT References: <1991Feb7.165018.768@cunixf.cc.columbia.edu> Sender: news@ut-emx.uucp Reply-To: daveh@ccwf.cc.utexas.edu (David H. Huang) Organization: The University of Texas at Austin Lines: 30 In article gt0t+@andrew.cmu.edu (Gregory Ross Thompson) writes: >stc7@cunixb.cc.columbia.edu (Steven T Chiang) writes: >> I have a couple of questions. Does anyone know what the >> softswitch $c0e2 does, or what information it contains? I couldn't >> find any info about it in the firmware ref, or hardware ref. > > According to my "Apple IIGS Technical Reference" book, C0E2 is Disk >stepper motor phase 1 low. That's a new feature in the GS that's not >in the older //'s according to the book. It doesn't say any more than >that about it, though. It's new in that it's built into the GS (IWM?). If you have a Disk II controller card in slot 6 of any Apple II, C0E2 is also stepper phase 1 low I believe C0E9 turns the disk drive on, and accessing C0E0-C0E7 will make the head move up one track. Accessing C0E6 C0E7 C0E4 C0E5 C0E2 C0E3 C0E0 C0E1 will make the head move down one track (I could be wrong though, this is just from memory). Does anyone know how to do stuff like this with the Apple 3.5 drive (I'm pretty sure it's possible, since the Apple 3.5 is a dumb drive, and progs such as ZZCopy and Photonix seem to take advantage of that. > > -Greg T. -- David Huang | Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" America Online: DrWho29 |