Date: Sat, 25 Apr 1998 21:58:37 +0000 From: Kees Jan Koster <dutchman@tccn.cs.kun.nl> To: XFree86@XFree86.org Cc: FreeBSD Hardware List <freebsd-hardware@FreeBSD.ORG>, dutchman@tccn.cs.kun.nl, Javaan.Chahl@anu.edu.au Subject: SUN grayscale monitor on PC Message-ID: <35425C8D.41C67EA6@tccn.cs.kun.nl>
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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.
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