Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site pucc-i Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!inuxc!pur-ee!CS-Mordred!Pucc-H:Pucc-I:ags From: ags@pucc-i (Seaman) Newsgroups: net.micro.apple Subject: Re: hires_question Message-ID: <394@pucc-i> Date: Tue, 14-Aug-84 11:23:28 EDT Article-I.D.: pucc-i.394 Posted: Tue Aug 14 11:23:28 1984 Date-Received: Thu, 16-Aug-84 01:18:31 EDT References: <494@bunker.UUCP> Organization: Purdue University Computing Center Lines: 20 The "double-density" hi-res mode is a hardware feature of the Apple //e. No modification is required. All you need is the Apple extended 80-column board (the one with 64K on-board memory, for a total of 128K). Double density probably also works with the Apple //c, but I can't say for sure. It definitely does not work with the II+, and there is no simple hardware modification that will make it work. One exception: If you have a //e with a "Revision A" motherboard (manufactured within the first month or so after the //e was released) you may need a hardware modification, which your Apple dealer will handle for free. You must have the Extended 80-column board in order to get the modification. The only software I have heard of which makes use of double-denity hi-res graphics is Apple Pascal 1.2. The Apple //e Reference Manual and the Extended 80-column Card User Manual describe how double-density mode works (i.e. what soft switches to set, and how the memory is mapped). -- Dave Seaman My hovercraft is no longer full of ..!pur-ee!pucc-i:ags eels (thanks to my confused cat).