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Found 6 results

  1. Building „The Voice“ into a PHILIPS G7400/Magnavox Odyssey and staying fully compatible There I was with my PHILIPS G7400 console and a newly acquired „The Voice“ speech-add-on, which was only made for the PHILIPS G7000, not the G7400, and therefore does not fit onto the G7400 housing at all. And which uses an inbuilt speaker, which makes it sounding odd - speech and sound comeing out of two different sources. Wouldn’t it be nice to put „The Voice’s“ circuitry into the G7400? Problems: Electronically - not all extensions and cartridges are compatible with „The Voice“. It must be possible to switch it off and „remove“ it electronically. Mechanical - how to fit all those components into the G7400 housing and attach them firmly. "The Voice" interrupts a few lines of the regular cartridge interface, to control the speech synthesizer's actions and to provide a memory interface for external cartridge speech roms. So far, this has only been used for „SID, the Spellbinder“, but who knows, maybe some future homebrew project will need this too. The memory interface uses lines, that are not used by most of the game cartridges, except i. e. C7010 CHESS and C7420 BASIC. These plugins do not expect „The Voice“ to be sitting on the lines to the G7400 console. Therefore, to stay compatible, it is necessary to reconnect the interrupted lines. „SID, the spellbinder“-PCB. Cartridge with programme rom and the GI speech rom: Looking at PCB and schematics, I identified six affected lines: Leading from G7400 to „The Voice“: A(!CartWriteEnsble) —> to reset logic IC1 pin 2 B(PlusModeSelect) —> ground E(ChipSelect) —> not connected 1(T0) —> to SP256 synthesizer chip !LRQ 10(A10) —> not connected 11(!ChipSelect P14) —> to reset logic IC1 pin 1 Leading from „The Voice“ to cartridge port: A(!CartWriteEnsble) —> memory interface: C2 B(PlusModeSelect) —> memory interface: serial in E(ChipSelect) —> memory interface: C3 1(T0) —> memory interface: C1 10(A10) —> memory interface: serial out 11(!ChipSelect P14) —> memory interface: rom clock All the other lines are just fed through. I decided to use some simple changeover contact relais, which are operated by a mechanical switch turning on and off 12 VDC for the coils. Mechanically there surely are many possibilities. I decided to shorten the cartridge duct, to gain space inside the housing and to put my switch-device between G7400-PCB and cartridge connector. Be warned: It is a lot of work and I had to abuse the PCBs quite badly. This might not be an adequate job, if you are doing something like this for the first time. Some practice is helpful. There is a chance to destroy your console . I wanted the switching-device to consist only of one board and I wanted the whole thing to be plugable, which makes repairs or future changes easier. I’ll present some pictures, just to give you an impression. I have more. If somebody should have more interest and want to do the same, I can provide more pictures and information. Feel free to PM me anytime. „The Voice“ as we know it: The G7400 ripped apart during a test run: The switch device with the new cartridge connector board: Changes on the duct: New cartrige connector attached: Fom the other side: The G7400 PCB with removed cartridge connector and new connector cables leading to the switch device: The speech synthesizers audio line soldered onto G7400-PCB: „The Voice“. Desoldered cartridge connector and "The Voice" rom board, now connected via cables to gain some space below the cartridge duct: The Sandwich: connector board, switch device, speech synthesizer and G7400-PCB. Look, how the synthesizer board is attached to the upper housing. It is just pinched between cartridge duct and the middle plastic distance holder. PCB and holder can be adapted a bit with a file: Everything back into the housing: That’s what it looks like now. The cartridges are sitting a few centimeters higher, now. With voice on/off switch and a volume knop for speech output. Nice, compact — and working:) Special thanks all the guys at http://www.videopac.nl and its forum, who are providing excellent information on all aspects of the Videopac/Odyssey related systems. A MUST-website for all friends of the platform! And of course to all the guys on all the other VIDEOPAC related websites, where people posted schematics, service manuals or their own papers, with explanations, how the G7000 works. Best regards!
  2. So I completed the G7400 RGB addition mod as described here. It was surprisingly simple and took me about an hour to finish. I now need to build the 8 pin DIN to SCART cable. I am not familiar with building these, but I can't imagine it would be too difficult. So I hope someone here could give me some tips to help me complete it. Here is DIN Connector Pinout (according to the website at the link above) 1: RGB status (75 Ohm, 3 V) 2: Ground (0 V) 3: Blue (75 Ohm, 0.7 Vtt) 4: Composite Video (CVBS) (75 Ohm, 1 Vtt) 5: Red (75 Ohm, 0.7 Vtt) 6: Status CVBS (VCR) (10 kOhm, 12 V) 7: Sound 8: Green (75 Ohm, 0.7 Vtt) Here are my questions: 1) Do I add a 10 kOhm resistor to scart pin 6 and 75 Ohm resistors to scart pins 1, 3, 4, 5, and 8? 2) Does the symbol on scart pin17 (see fig) mean that I just connect it to the metal connector (pin 21)? 3) Are there any other components that I should be adding to the cable? Any help or additional info would be greatly appreciated. Thanks
  3. Hi! I'm selling off my private collection and have a few Videopac rarities up for auction on e-bay. Trans american rally, Helicopter rescue, Rare Swedish/Danish version of Backgammon and a few more. Check it out: https://www.ebay.co.uk/itm/183711701033 Regads
  4. I hope someone out there can help me with a question about general electronics and, in particular, the Videopac G7400 power supply. I live in the US and I recently imported a G7400 Videopac from Europe. I originally was going to get a voltage converter, but I was reading the import guide at this website and on step 3 there is mention of swapping the original power supply with a regulated 12V/5V US power supply. I am perfectly comfortable with the actual replacement, but I don't have the technical knowledge about electronics to ensure that I won't do anything really stupid and install an incompatible PSU. So my question is: Can someone give me some info or a link to a regulated 12V/5V US power supply that would be safe to use? Thanks!
  5. All prices are before shipping. International buyers be aware that shipping from the US is outrageous. $210 shipped in the US for all friends and family payment for the remaining games! Brazilian Releases: All have Flip Case, Game, Manual, Index Card except for Powerlords (missing index card). 06AV9401 Bacará! - $20 06AV9404 Boliche! / Basquetebol! - $10 06AV9410 Golfe! - $10 06AV9411 Conflito Cosmico! - $6 06AV9414 Invasores do Cosmos! - $6 06AV9416 Duelo no Velho Oeste! - $6 06AV9424 Bilhar! - $15 06AV9426 Caça Niqueis! - $10 06AV9427 Barricada! / Demolicao! - $10 06AV9428 Alien! - $6 06AV9430 OVNI!- $10 06AV9432 Macacos me Mordam! - $12 06AV9441 Batalha Medieval! - $22 06AV9442 Come Come! - $10 06AV9443 Acróbatas! - $12 06AV9445 Senhor das Trevas! - $12 06AV9446 Tartarugas! - $12 06AV9447 Abelhas Assassinas! - $12 06AV9462 Desafio Chinês! - $150
  6. Hello all Signed up here to ask for help regarding RGB output for G7000 / G7400. In short, I need to record a bunch of videos of various Videopac games for my project 8bitmemoirs.com For this reason, one of my mates have modded my G7000 to have RGB output, but it's displaying wrong colours. I found a video on YouTube demonstrating the exact same problem: https://www.youtube.com/watch?v=ct6Wv3eyPzM#t=2m20s Notice the red and blue is way too dark. That's not how the colours are supposed to look in that game ("Race"). So for a short while I gave up on RGB and asked my mate to instead put in a composite mod, which he did, and it works but the picture is just as awful as an RF signal. Therefor I'm back to hunting a good RGB solution signal now. So I have 3 questions for you all: 1) Does anyone know why the colours are too dark with an RGB mod for G7000? Is there anything we can do about it? 2) Is the RGB output better on the G7400? And is it easy to add an RGB mod to the G7400 that doesn't come with one pre-installed? 3) Are there anyone here who has a spare G7400 with RGB output they'd be interesting in selling? Some pictures demonstrating my problem: http://www.amibay.com/showthread.php?88818-Help-requested-for-RGB-output-for-Philips-G7000-Videopac Thanks!
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