Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site uvicctr.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!vax135!cornell!uw-beaver!ssc-vax!uvicctr!collinge From: collinge@uvicctr.UUCP (Doug Collinge) Newsgroups: net.micro.atari Subject: Interfacing an ST Message-ID: <152@uvicctr.UUCP> Date: Thu, 12-Sep-85 19:23:59 EDT Article-I.D.: uvicctr.152 Posted: Thu Sep 12 19:23:59 1985 Date-Received: Sun, 15-Sep-85 12:21:38 EDT Distribution: net Organization: University of Victoria, Victoria B.C. Canada Lines: 20 I am interested in interfacing some magic hardware to an ST. I see two possibilities: the DMA port and the cartridge slot. However, this hardware needs to be written to and >>>>>>>>>> the cartridge slot does not have R/W! <<<<<<<<<< I couldn't believe this when I saw it but it's true. However, this can be probably be overcome by using a high-order address line as R/W and agreeing to write only to one half of the address space and to read only from the other half. See any problems with this? Excepting "Yeccchhh!", of course. The problem with the DMA port is that I don't know how it works. Can anyone enlighten me? DMA would be nice for this particular hardware. -- Doug Collinge School of Music, University of Victoria, PO Box 1700, Victoria, B.C., Canada, V8W 2Y2 decvax!nrl-css!uvicctr!collinge decvax!uw-beaver!uvicctr!collinge ubc-vision!uvicctr!collinge