From owner-freebsd-hardware Sat Apr 25 13:58:49 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id NAA16446 for freebsd-hardware-outgoing; Sat, 25 Apr 1998 13:58:49 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from tccn.cs.kun.nl (tccn.cs.kun.nl [131.174.32.38]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id NAA16391 for ; Sat, 25 Apr 1998 13:58:40 -0700 (PDT) (envelope-from dutchman@tccn.cs.kun.nl) Received: from LikeEver.ccg.nl (kees.sci.kun.nl [131.174.10.40]) by tccn.cs.kun.nl (8.8.5/8.8.5) with SMTP id XAA20319; Sat, 25 Apr 1998 23:05:51 +0200 (CEST) Message-ID: <35425C8D.41C67EA6@tccn.cs.kun.nl> Date: Sat, 25 Apr 1998 21:58:37 +0000 From: Kees Jan Koster X-Mailer: Mozilla 3.04Gold (X11; I; FreeBSD 2.2.2-RELEASE i386) MIME-Version: 1.0 To: XFree86@XFree86.org CC: FreeBSD Hardware List , dutchman@tccn.cs.kun.nl, Javaan.Chahl@anu.edu.au Subject: SUN grayscale monitor on PC Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Dear XFree86@XFree86.org, FreeBSD Hardware, and Javaan.Chahl@anu.edu.au, I've connected a Sun 3, fixed sync, grayscale monitor to my PC running FreeBSD and XFree86. Since it took me a long time to find the info I needed to make this work, I'm mailing it on these lists for other people's reference. I soldered the following circuit, that was suggested by Javaan.Chahl@anu.edu.au. It XNORs the HSync and VSync together. I still need to connect the other inputs to +5V or ground, but I haven't looked up the pinout of these chips yet. 1 +------+ +------+ VGA 13 (HSync) ----| | 3 3 | | 2 | |------| |O--- Composite Sync VGA 14 (VSync) ----| | | | 2 +------+ +------+ 74HC86 74HC4049 Next, I added this modeline to my XF86Config, and adapted my "Screen" section accordingly. Modeline "1152x900" 94 1152 1224 1324 1540 900 904 920 940 I got the power from a modified splitter cable for disk drives (using the yellow lead). Finally, I connected the green output (VGA 2) to the monitor's Video input. For grounding the whole thing, I used VGA 5. Frankly, I was surprised how easy the whole operation was (and how much heat the monitor produces.) Some questions remain, though: *) Is there an undocumented) +5V on the VGA output of my video card? *) What are those `Mon ID' bits on the VGA connection? Are they input or outputs? *) What was first; the chicken, or the egg? *) What is the frequency range that this monitor can work with? *) If I want to mix the three VGA colour components, instead of using just the green one, what ration should I use? What circuit would that be? Thank you for your time. Yours, Kees Jan PS. Please CC me, as I'm not on the list. ---------------------------------------------------------------------- Kees Jan Koster Hatertseweg 468 6533 GV Nijmegen the Netherlands tel. +31-24-3555870 e-mail: dutchman@tccn.cs.kun.nl ---------------------------------------------------------------------- The reason computer chips are so small is computers don't eat much. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message