Thanks for the information on that, but have you seen anything that someone may have put something together that does that? I know that the 15.75KHz RGB monitor would be the best and easiest, but in places like the computer system like the Tandy Color Computer 3 and the MM/1 I don't think would be a good idea to hook up to a large game system screen. I have the circuit that brakes the Composit sync into the sepr. H-Sync and V-Sync. That opens up a lot more 15.75KHz monitors, but still I have checked into getting my hands on some monitors. They are just very hard to get. I have been able to find normal VGA and sometimes a good SVGA monitor that someone has given to the GoodWill and the GoodWill is selling them for anywhere between $15 and $50. Thats how I got the two VGA monitors I got now. I can get a lot more as they come in. That is why I thought it would be best for me to try to build a converter or find someone that has already built one and just build it the way they did. I am looking at the cost factor in this case. Like one time I found someone selling a Sony 15.75KHz monitor and they would not sell under $200. I took a look at and it had a grate picture, but the cost for something so old is the other factor. Plus I have some club members that have the same problem that would like to use some VGA type monitors on their Color Computer 3 and/or MM/1 systems. I just need to know if anyone has seen anything. Well, I got to run now. I do thank you for your input and I hope to get more input from you and other people down the line on this item. Thanks. Mike Keitz writes: From: mkeitz@juno.com (Mike Keitz) Received: from m7.boston.juno.com (m7.boston.juno.com [205.231.100.196]) by m4.boston.juno.com (8.8.6.Beta0/8.8.6.Beta0/2.0.kim) with ESMTP id VAAAA24937 for ; Fri, 20 Feb 1998 21:47:57 -0500 (EST) Received: (from mkeitz@juno.com) by m7.boston.juno.com (queuemail) id VWM19245; Fri, 20 Feb 1998 21:47:28 EST Return-path: To: dladd@juno.com Date: Fri, 20 Feb 1998 21:51:00 -0500 Subject: Re: 15.75KHz monitor to 31.25KHz monitor conversion Message-ID: <19980220.215352.3478.5.mkeitz@juno.com> On Fri, 20 Feb 1998 19:13:50 -0600 David Ladd writes: >Hi all, > >I just got started into the PIC world. I have been finding that these >PIC chips are very handy little items. A friend had asked me to >install a chip he had ordered into his playstation for the MOD >upgrade. I looked at the chip and found that it was a PIC16F84-04/P. >I have been using a Magnavox RGB monitor with it, but it is about to >die. I have a extra VGA and SVGA monitors sitting around and would >like to use one of them. I know that the Magnavox and other same type >RGB monitors use a 15.75KHz H-Sync. The VGA and SVGA type monitors >will only take a min. 31.25KHz. Has anyone done any projects using a >PIC or something sim. to do a conversion between 15.75KHz to 31.25KHz. This is not a project for the beginner. Think about what has to be done. The converter would need to store a whole line of video (all 3 colors), then replay it twice at twice the normal rate. While replaying, the converter would need to be simultaneously sampling and storing the next line. A better converter would store a whole *frame* of video so it could deinterlace the video first ("Scan doubler") then display it at 31.5 KHz non-interlaced. So we're talking fast A/D and D/A converters, and a fast RAM. The PIC16F84 can do quite a bit, but it could only serve a supporting role in this project. A lot more hardware would be needed. There are commercial units that go the other way (convert VGA to 15.75 KHz for display on TV-type hardware), but I don't know if any up-converters exist other than PC video cards that allow sampling and viewing of TV signals. A scan doubler could work. These are integrated into many high-end TVs. If you had a high-end TV, you certainly wouldn't be tearing it apart to get the scan doubler out of it. Probably they are not designed for RGB input either. You really need a monitor suitable for 15.75 KHz in the first place. Unfortunately they are scarce. I have an anchient Zenith ZVM-135 on one Playstation, and the other is fitted into an arcade cabinet with a 19" RGB monitor (Wells-Gardiner 7000 type). Of course I built a Playstation control panel with real arcade joysticks and buttons too. This setup absolutely rules! Once I saw Playstation RGB, my opinion of console games changed quite a bit. You may want to start lurking around the arcade groups and try to latch onto a monitor and cabinet. Nearly all arcade games use a 15.75 KHz RGB raster scan. And a nice big screen. Unfortunately the monitor unit by itself is of open-frame construction that isn't safe to leave in the living room near children and pets. And the isolation transformer, found in the base of the cabinet, is essential for safety. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866] _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]