Unstablewarpfield Posted June 7, 2017 Share Posted June 7, 2017 Hey people, I have here (what I think) is a Secam intellivision (model 5156). It was obtained from France and I wanted to mod it to output RGB. I did this once on my pal system and it works fantastic. That said... that pal system contained an LM1886N which I could use to tap into the rgb and sync lines. Not so with this one however... Here is a picture of what I see. U4 is in the red circle (YA-3-8900) U10 is in the blu circle (N82S147N) U14 is in the yellow circle (74LS273N oh... me thinks... I just have a look around U10, which is what my pal used as a video decoder and I'll pull a similar trick on that IC. Unfortunately the datasheet tells me nothing of which is what. All I managed to discover is that there are 4 traces coming out of U4 running to U10. From that point on, 4 traces also leave U10 and get to U14. From U14 those 4 traces combine into one through some resistors and run into the RF box. I guess the big question is... what are those 4 traces? I guess I could not be so lucky for them to just be RGB and sync and pul them off of one of those IC's could I? Anyone got a clue? Quote Link to comment Share on other sites More sharing options...
Intymike Posted June 7, 2017 Share Posted June 7, 2017 It should be possible. My french Peritel RGB Intellivision is made from a 5156 model. For a second I had the feeling that it was made from a german 5370 model, but it's a 5156. Quote Link to comment Share on other sites More sharing options...
mr_me Posted June 7, 2017 Share Posted June 7, 2017 (edited) I thought the French secam Intellivisions had scart/peritel RGB out of the box. Did this one not come with an Intellivision case? edit: It has Intellivision II chips on it. Edited June 7, 2017 by mr_me Quote Link to comment Share on other sites More sharing options...
Intymike Posted June 7, 2017 Share Posted June 7, 2017 The French peritel Intellis were factory modded. Quote Link to comment Share on other sites More sharing options...
mr_me Posted June 8, 2017 Share Posted June 8, 2017 (edited) So did they also have Intellivisions in France with RF instead of peritel RGB? Edit: Yes, they did and some variations. This one is definitely a 5156. There are some pictures of the exact same revision in the link below. So they did have Intellivision IIs in France but in an Intellivision 1 case. http://www.gamopat-forum.com/t89204-les-differentes-versions-d-intellivision Edited June 8, 2017 by mr_me 1 Quote Link to comment Share on other sites More sharing options...
Unstablewarpfield Posted June 8, 2017 Author Share Posted June 8, 2017 This Intellivision came in a model one case. It is defenately a French model, but without scart. It just has RF. I noticed it looks like an inty 2 on the inside but not exactely. It also is not exactely thesame version as on that website since that one has a seperate psu board. On mine the large capacitors are on the mainboard and there is no seperate pcb for them. Just the transformer feeding directly into the main board. I have found some clues to composite mod it, but I'd rather have rgb. Is there a chance that the 4 signals I mentioned could be the rgbs traces? Quote Link to comment Share on other sites More sharing options...
GroovyBee Posted June 8, 2017 Share Posted June 8, 2017 What is the crystal frequency on that PCB? Its the grey looking can next to R9 and R10. Quote Link to comment Share on other sites More sharing options...
mr_me Posted June 8, 2017 Share Posted June 8, 2017 (edited) To the software, its an Intellivision II. So it's audio is like an Intellivision II and has the same game incompatibility ie. Word Fun and Coleco. The photos in the comments section of that site, looks exactly like yours with the voltage regulator and large capacitors on the main board. PN 5156-4369 mattel 1983. Its an interesting variation. The ay-3-8900-1 outputs five signals that is not RGB. Its described in the inputs of the ay-3-8915 spec. There's a four-bit digital code for the 16 colours. I'd think the ay-3-8900 version in yours is similar. That chip has a fifth output signal at pin 19. The 82s147 is a programmable logic chip (4kbit ttl bipolar prom) hard to say what it does or outputs. If Its inputs come from the ay-3-8900 those inputs are likely not rgb. Someone more knowledgeable with electronics might have an idea what its capable of doing. The 74LS273N is described as flip flops. My guess is that since it feeds the RF modulator it outputs some form of secam colour signal. My guess is that the inputs wouldnt be much different and its perhaps synchronising the different signals together. The LM1886N in other Intellivisions inputs rgb on nine signals and outputs color difference. There's nothing like that in this one. My guess is that the 82s147 outputs some form of secam colour video like the ay-3-8915 outputs ntsc colour. Edited June 8, 2017 by mr_me Quote Link to comment Share on other sites More sharing options...
JohnPCAE Posted June 9, 2017 Share Posted June 9, 2017 (edited) '273's are octal D-type flip-flops. I have a ton of them. I'd recommend first tracing pins 16, 18, 19. 21, and 22 from the STIC. Those determine the colors that are output to the TV, as well as sync and blanking. Pin 19 is only high during blanking and the other four determine pixel color. That sure is a strange beast, though. It has the rows of 5.6k resistors on the hand controllers that only the Inty II has. I wonder if it follows the Inty II schematic or if it's a hybrid. The four resistors just to the right of the '273 that is circled jump out at me. That's the register ladder specified in the schematic between the color chip and the modulator: 22k, 11k, 5.4k. 2.7k. So you need to look for whatever is between those resistors and the STIC. That said, my understanding is that to implement an RGB conversion all you really need are the STIC outputs (aforementioned 5 pins). V1 through V5 on the NTSC chip directly map to V1-V5 on the STIC. Regardless of what lies between your STIC and the modulator, the meaning of those 5 STIC outputs should be the same. Edited June 9, 2017 by JohnPCAE Quote Link to comment Share on other sites More sharing options...
Unstablewarpfield Posted June 12, 2017 Author Share Posted June 12, 2017 (edited) What is the crystal frequency on that PCB? Its the grey looking can next to R9 and R10. It's a 4.000 Mhz crystal. Edited June 12, 2017 by Unstablewarpfield Quote Link to comment Share on other sites More sharing options...
mr_me Posted June 12, 2017 Share Posted June 12, 2017 (edited) ... That sure is a strange beast, though. It has the rows of 5.6k resistors on the hand controllers that only the Inty II has. I wonder if it follows the Inty II schematic or if it's a hybrid. .... It has the "Mattel-LAD" custom chip that only the Intellivision II has. Edited June 12, 2017 by mr_me Quote Link to comment Share on other sites More sharing options...
GenetixJ Posted July 7, 2017 Share Posted July 7, 2017 A new variant or hobbyist creation? Quote Link to comment Share on other sites More sharing options...
mr_me Posted July 8, 2017 Share Posted July 8, 2017 A new variant or hobbyist creation? It is a Mattel creation. There are lots of internal variations to the original 2609 that haven't been documented. That French forum group tried to document all the French internal variations. Since the Intellivision II was not released in Europe it would make sense to eventually just put the Intellivision II inside it. If anyone has an original Intellivision master component that doesn't play some Coleco cartridges they should open it up to see if there is an Intellivision II inside. Quote Link to comment Share on other sites More sharing options...
CatPix Posted July 8, 2017 Share Posted July 8, 2017 One thing that I noticed is that French Intellivisions with RGB SCART tend to overheat and go to black screen after 5/10 minutes of use. Is that a thing specific to them or other Intelli are plagued with that issue? Quote Link to comment Share on other sites More sharing options...
pimpmaul69 Posted July 11, 2017 Share Posted July 11, 2017 One thing that I noticed is that French Intellivisions with RGB SCART tend to overheat and go to black screen after 5/10 minutes of use. Is that a thing specific to them or other Intelli are plagued with that issue?cracked solder joints on the big capacitors will do this too. That is the first thing i would look at. Quote Link to comment Share on other sites More sharing options...
CatPix Posted July 11, 2017 Share Posted July 11, 2017 Make sense yeah. I don't have one myself (a RGB one) but I know someone who own one and it suffer from it. But we both have RF SECAM Intelli and they run flawlessly for hours. Maybe either the RGB board suck more power so it heat more and crack the boards more. Or/and SCART models would be latter releases (would make sense, SCART was made compulsory on TV in 1981, so making SCART model prior to that date and even later would have little sense as so few people would have a compatible TV) and cost reduction almost always mean smaller boards, cheaper components and more potential failures 30 years after. Quote Link to comment Share on other sites More sharing options...
scalpel Posted July 11, 2017 Share Posted July 11, 2017 If you are looking for a Scart French version, I have one to sell Quote Link to comment Share on other sites More sharing options...
CatPix Posted July 11, 2017 Share Posted July 11, 2017 That will depend on the price I'm patient. I've been waiting three years to get one (note : loose, not boxed - boxed is a plus, but usually that mean bringing the price over 70/80€ ). I can wait more Quote Link to comment Share on other sites More sharing options...
scalpel Posted July 11, 2017 Share Posted July 11, 2017 That will depend on the price I'm patient. I've been waiting three years to get one (note : loose, not boxed - boxed is a plus, but usually that mean bringing the price over 70/80€ ). I can wait more I have one boxed and loose to sell. But not at 70/85 euros I could sell the loose one for 175 and the boxed one for 225 euros. I know it's expensive but priceless Quote Link to comment Share on other sites More sharing options...
CatPix Posted July 12, 2017 Share Posted July 12, 2017 (edited) Thanks but no thanks. I don't doubt you got things that would be 100% top notch, but so far the most expensive SCART Intellivision I've seen on Leboncoin was 180€; boxed, with some games for them. Right now you have at least one boxed for 110€, and one loose for 70€ with 8 games (but it suffer from the "goes extinct after 5 minutes" issue.) Edited July 12, 2017 by CatPix Quote Link to comment Share on other sites More sharing options...
YannAros Posted October 14, 2020 Share Posted October 14, 2020 Hi, If you're still interested in the subject for french/SECAM Intellivision RGB mod, I've worked on it and found several things: 1. There are at least 2 totally different motherboards with SECAM RF output First one, referenced mainly as 5156 / P2, has an additional mezzanine board developped by CGV (a french company) to adapt it for SECAM, it also has a specific "CGV" sticker on its back Second one, referenced as 5156 / RH, has a single PCB (even power supply is integrated) and is natively supporting SECAM, no modification is visible 2. I've created an RGB mod for the first version ("P2") that is tested and is working, it is close to the ZOE for PAL version. Some kits can be pre-ordered (I'm still waiting for some parts before I can send them out) 3. For the "RH" version, the mod is on-going, it is closer to what is needed for the NTSC version of the intellivision. First tests are showing that it shoudl work, but I couldn't finalise the mod yet due to missing components. As soon as I will have received my latests order I will confirm/infirm that it is working. You can find more details here (in french) : https://www.gamopat-forum.com/t109948-precommande-module-rgb-pour-intellivision-secam The schematics and gerber files will be published and open sourced as soon as I have confirmed everything is working. Quote Link to comment Share on other sites More sharing options...
YannAros Posted October 23, 2020 Share Posted October 23, 2020 Dear All, Going further with these mods, it looks to me that the "Secam P2" mod should wortk on any PAL Intellivisions and that the "Secam RH" mod should work on NTSC Intellivisions. The projects are Public Domain: Version P2 : https://easyeda.com/yannick.erb/Intellivision-Secam-to-RGB_copy Version RH : https://easyeda.com/yannick.erb/Intellivision-Secam-RH-RGB-Mod_copy The only thing I ask for is not to resell them for more than 20€ for the P2 and 30€ for the RH. And if anyone make a batch of RH version to send me one exemplar as I have not enough pre-orders at the moment and will therefore not launch a build. If you'd like to pre-order one or the other of these versions just post here or PM me. 2 Quote Link to comment Share on other sites More sharing options...
YannAros Posted November 3, 2020 Share Posted November 3, 2020 A short youtube video to show the result : 1 Quote Link to comment Share on other sites More sharing options...
scalpel Posted November 3, 2020 Share Posted November 3, 2020 Hello, That'a a really good job ! Congrats ! Quote Link to comment Share on other sites More sharing options...
First Spear Posted November 7, 2020 Share Posted November 7, 2020 On 10/14/2020 at 4:23 AM, YannAros said: Hi, If you're still interested in the subject for french/SECAM Intellivision RGB mod, I've worked on it and found several things: 1. There are at least 2 totally different motherboards with SECAM RF output First one, referenced mainly as 5156 / P2, has an additional mezzanine board developped by CGV (a french company) to adapt it for SECAM, it also has a specific "CGV" sticker on its back[snip] I have one of these. I would love to pay someone to make it HDMI capable. Quote Link to comment Share on other sites More sharing options...
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