Xref: utzoo comp.sys.mac.hardware:397 comp.graphics:8474 rec.games.video:4101 comp.misc:7366 rec.games.programmer:1397 Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!snorkelwacker!apple!gem.mps.ohio-state.edu!wuarchive!wugate!uunet!mcsun!sunic!tut!santra!kampi.hut.fi!jmunkki From: jmunkki@kampi.hut.fi (Juri Munkki) Newsgroups: comp.sys.mac.hardware,comp.graphics,rec.games.video,comp.misc,rec.games.programmer Subject: Re: Sega 3D Glasses Interface (ASCII & GIF) Message-ID: <26702@santra.UUCP> Date: 15 Nov 89 16:43:33 GMT References: <26631@santra.UUCP> Sender: news@santra.UUCP Reply-To: jmunkki@kampi.hut.fi (Juri Munkki) Followup-To: comp.graphics Organization: Helsinki University of Technology, Finland Lines: 384 This version of the Sega 3D glasses is mostly text, but the pictures have been joined into a single GIF file. The gif file has been uuencoded and can be found after the text. I recommend that you print the MacWrite version, but this posting is for those who can not read MacWrite files. Connecting the Sega 3D Glasses(tm) to the Macintosh(tm) Part I, The Hardware Version 0.9, Copyright 1989 Juri Munkki This document describes how I connected the Sega 3D Liquid Crystal Shutter Glasses to my Macintosh II RS-422 port. With the glasses you can use software specifically made to display a stereo pair of images. This method of displaying 3D graphics gives most users a feel of depth in the image. Stereo viewing has interested me for years. I regularly read the usenet rec.games.video newsgroup, since it occasionally contains information on coin-ops. When the Sega Master system was introduced, I read about it and discovered that it can control 3D-glasses. I immediately became interested, but I had trouble finding Sega in Finland. This lead me to post an article in rec.games.video. As it happens, Stan Lackey had already built an interface for his 8-bit Atari computer. With his help, I built an interface that works with the Macintosh. It should work fine with any RS-422 or RS-232 serial port and if you know some electronics, it shouldn't be too hard to modify it to work with other interfaces as well. All my thanks go to Mr. Lackey. Building the circuit requires a certain amount of experience with a soldering iron and I recommend that you verify your circuit with a digital multimeter. You are the only one responsible, if this circuit manages to fry your serial port, your computer or something else. The circuit can be tested without plugging it to the serial port. I recommend that you use a 9V battery and connect it to the inputs that would normally take the TxD+ and TxD- signals. I haven't drawn a circuit board for this project. I simply used a prototyping board and connected the components with wire. Here's the list of components I used: Amount Item Comments 1 CMOS-555 Timer 1 CMOS-4013 D-flip/flop with two inputs 1 CMOS-4070 Quadruple 2-input exclusive or gate 1 Rectifier I just bought one with a low voltage specification 2 0.1 uF capacitors 1 0.01 uF capacitor 2 3 kOhm resistors I used a single 4.7 kOhm trimmer 1 3.5 mm stereo connector A female connector like those in Walkmans. 1 Circle-8 connector A male connector for the Macintosh serial port. 2-4 meters wire some shielded cable with 3 wires 1 VERO-board A prototyping board of some sort It is very important that you use CMOS-parts, since the operating voltage is 10 V. We need 10 V, because the glasses use a 400 Hz square wave when they are opaque. When they get 0 V, they are transparent. Below is the circuit that I used. I knnow that it's optimal (I think it might work even without the 4013, if you changed a few resistor values), but I have built two of them and both work. The one I'm currently using has a trimmer instead of the two resistors. If you are using a trimmer, you might want to use an oscilloscope to verify that you are getting 400 Hz at the output plug or 1600 Hz at the 555 output (Pin 2). I used my Mac II as the oscilloscope. Since the frequency is audible, I was able to digitize it with my Impulse audio digitizer. The rectifier (the leftmost component) is used to provide power for the circuit. I connected the 0.1 uF capacitor to the rectifier output so that the power would be steadier, but I haven't actually calculated what it's effect is. I don't think that it has caused any problems, but someone more proficient in electronics might want to put something else there. The 555-timer is connected according to a circuit in a data book I found here at the university. The frequency of this circuit is 1.44 / ((Ra + 2Rb) C), where C is the capacitance of the rightmost capacitor. We see that with the specified resistors and capacitor, the frequency is 1600 Hz. The D-flip/flop is used to divide this frequency to 400 Hz. The 400 Hz clock signal is fed to the other input of three exclusive or gates. Of the remaining three pins, one is grounded. That gate outputs the clock unchanged and it is connected to the ground wire of the 3D glasses. The remaining two pins are connected to TxD+ and DTR. These two lines can then be used to invert the clock signal. When the clock is not inverted, the output is the same as in the ground wire, i.e. the potential is 0 V. When the clock is inverted, the we get 400 Hz alternating current of +/- 10 V. The signals look like this: Here are the pinouts of the three circuits I used: (Uuencoded GIF file included at the end of this document) The following three Macintosh serial port pins are used: Pin 6 is TxD+ Pin 3 is TxD- Pin 1 is DTR The easiest way to solder the pins is to buy a connector where the pins can be removed so that you can solder each pin individually. I also used shrinking tube (I don't know what it's called in English) to make sure that the wires do not touch each other. This document will be followed with Part II, a brief description of the software interface that is needed to program the glasses from a Macintosh. I already have some animation and fast 3D transformation routines ready, so I'll probably try to find time to write games for the glasses. I'll make the games either shareware or public domain. I'd really like to see a lot of software that supports these glasses and I wouldn't mind if someone started selling these interfaces to "the rest of us". If you want the sell the interface, please contact me before selling more than a few. I think any profits should be shared with those, who pioneered this interface. If you write software for the glasses, a nice way to remember me is to send a free copy for me to try out. I can then keep a list of compatible applications and make that information available to users (and possible clients). I occasionally come up with ideas like this interface and surprisingly often have the energy to do something about them. If you want to encourage me in these projects, please send me a postcard or letter. Donations are also ok. Juri Munkki Helsinki University of Technology Otakaari 1, U044B SF02150 Espoo Finland P.S. This is version 0.9, which means that I'm the only one who has built the interface. I'm still waiting for my friends to have time to design a circuit board so that it can be included in this document. Part II will describe the software. While you are waiting for software for the glasses, you can test them with your terminal program. The DTR signal, which controls the other lens, will invert when you start the emulator. 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