Date: Fri, 29 Nov 1996 06:32:44 -0800 To: tghack-list@cpac.washington.edu From: Stephan Schirrmann X-Software: MLF v2.3, Copyright 1995, 1996 by Bt X-Original-Id: <329E0E45.3F97@nepustil.net> Subject: Re: How to get RGB video from a Duo? X-UIDL: 50a699ccf3f41a4c78dc38b60f8a0255 Okay folks! > Chris Covell wrote: > :Hey, folks. Is it possible to get an RGB video signal from the Duo's DIN > :video output? I remember there was a big discussion about getting RGB > :video from the Genesis and SNES in the EGMs back in late 1991. I have a > :Commodore 2080 RGB monitor, and I'd like to get a clearer picture from my > :Duo. Even splitting it into chroma and luma composite would be good. Is > :there any possible way to do this? I once opened a RGB-modified Engine, copied the following RGB-modification and did it to several PCE Duo-R and -RX and it worked quite well. You can get all needed signals from the 6260-chip which is on the bottom of the circuit board(near the front left corner of the Duo) in the american Duo and on the upside of the circuit board (next to the joypad port) in the japanese Duo-R/RX. You'll need to solder wires to the following pins of the 6260: pin 44 = compsync pin 47 = green pin 49 = red pin 51 = blue But you should know that these pins aren't too big, be careful not to solder connections between the pins. If you just connect the pins to the input of an 15kHz-RGB-monitor the picture won't be very bright and perhaps the 6260 could even be damaged. To be on the save side use 3 simple npn-transistors to amplify the r/g/b signals in the following way: O +5V | B | / C R/G/B -------|< | \ E |_________________ R/G/B Out (can you recognize the transistor? ascii-painting is a bad job) You can get the +5V-supply from one of the 7805 voltage regulators (the right pin is the output) or from the joypad port which is next to the 6260-chip. (Joyport) ________===========________ O O __ O / \_________O 0 0 o o b o o o o o O O O The pin "b" is the +5V pin. This picture is the same for the american and the japanese Duo. Last not least we need the audio pins and a GND-connection. It'll be the best to take them directly from the A/V connector: pin 1 = Audio-R pin 2 = GND pin 5 = Audio-L Yup, that's it! Thomas Baetzler wrote: > Well, it is possible in a way - you'll have to replace the 5pin DIN > socket with a different socket that's got more pins to supply RGB and > audio signals aswell as GND. In my PCE I left the A/V-port where it was and put another 23-pin SUB-D connector into the casing. Then you can use a normal Amiga-RGB-Cable to connect the PCE to a monitor or tv with scart-input. Cya Stephan ----------------------------------------------------------------------- Date: Fri, 6 Dec 1996 05:20:47 -0800 To: tghack-list@cpac.washington.edu From: Stephan Schirrmann X-Software: MLF v2.3, Copyright 1995, 1996 by Bt X-Original-Id: <32A81983.272@nepustil.net> Subject: Re: How to get RGB video from a Duo? X-UIDL: 3854d51dc52025efac1898bfba2cb07b Yo Chris! > Okay, so now I've tapped the video from the 6260 (GOD, what a pain!), > burning out the fuse in the process (don't worry; my Duo's fine.), and I've > routed the R, G, B, and CompSync lines to outside my unit. I can get a > picture! But only by touching the R,G,B, and CompSync lines and putting > them into the composite in on my 2080 RGB monitor. Oops!? You used the FBAS Input on your monitor? Didn't try this before... But the RGB signals surely aren't thought to be used in this way. > Now what? I have some > questions: I'm supposed to boost the R, G, and B signals using a > transistor for each, right? Yup! > Do I boost CompSync too? Nop, you don't need to do that. > What different kinds > of transistors are there, and how would I identify an NPN transistor while > in Radio Shack? Here are some types of NPN transistors you could use: BC107, BC337, BC546... I used BC337's and they work quite well. If you use a 337 too B,C and E are connected as follows ________ /________\ (front view) | | | BC337 | | | | | |_________| | | | | | | C B E The BC546 is connected in the same way, the 107 has a different casing (metal). I didn't try these two, but they should work too. These transistors are standard types you should get them everywhere. > And then I'd want to use a 23-pin SUB-D connector to hook > it via an RGB cable into my 2080. So, what pins on the connector should I > have the R, G, B, and compsync lines go to? I did this as follows: Name | PCE internal | 23pin SUB-D | SCART | | connector (male) | connector (male) -----------+-----------------+--------------------+------------------------- red | 6260 pin 49 | 3 | 15 green | 6260 pin 47 | 4 | 11 blue | 6260 pin 51 | 5 | 7 compsync | 6260 pin 44 | 10 | 20