From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <199906110543.HAA00297@piglet.cpu.lu> Date: Fri, 11 Jun 1999 07:43:15 +0200 (CEST) From: Michel Lanners Reply-To: mlan@cpu.lu Subject: Re: Q: control is a C&T 65550? To: drow@false.org cc: linuxppc-dev@lists.linuxppc.org In-Reply-To: <19990610165732.A3984@drow.res.cmu.edu> MIME-Version: 1.0 Content-Type: TEXT/plain; CHARSET=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On 10 Jun, this message from Daniel Jacobowitz echoed through cyberspace: [snip'ed the details] > > I intend to see what I can do about documenting the hardware cursor. > With all the excellent advice I've gotten, I expect it won't be too > difficult. One thing I have done to look at hoe this stuff is working is to put the cursor under Macos and/or MacsBug at some precise location (top left corner), and look at the data in the invisible last portion of each scanline in VRAM. That should tell us how and in what format the cursor bitmap needs to be drawn. Restricting the cursor movement to horizontal movements, and looking at RaDaCal's registers, should tell us where the horizontal position needs to be set. Unfortunately, as to the registers that control the appearance of the cursor (visible/not visible; its colors, etc...), I have no iddea where exactly on RaDaCal they are, and how to identify them except by poking at registers from a distance... >> Obviously, all of the above information can be totally wrong ;-). If >> there is any Apple engineer in the audience who knows better, please do >> speak up! > > Unfortunately, the Apple engineers in the audience aren't allowed to :( What a shame! After all, the control hardware can be seen as a legacy device, being surpassed by any and all current video chips... or might Apple be hiding some really cool and powerful feature deep inside control? I doubt it.... Michel ------------------------------------------------------------------------- Michel Lanners | " Read Philosophy. Study Art. 23, Rue Paul Henkes | Ask Questions. Make Mistakes. L-1710 Luxembourg | email mlan@cpu.lu | http://www.cpu.lu/~mlan | Learn Always. " [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]