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Found 3 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. ok, I was just perusing our own favored webstore, Arcade Shopper, and I read the description (who does that anymore?!?!), and I came to the part about external power not being necessary, if you mod the speech synth with 1 wire on 2 points. Pin 1. (Excellent Description). I am still ubernoob in the TI world, but the fact that this simple oversight on TI seems... ludicrous? Unless.... the peripherals connected beyond the SS would have been externally powered. Well I will tell you what mod I am doing after I get home tonight!!
  3. Well, as with a lot of postings that I am finding nowadays... Buyer beware. I did just get a Speech Synthesizer for $20 with shipping. Whether or not it works has yet to be seen. I will keep you all posted. and if I can do the Power Pass through I more than likely will. I don't understand why (probably because I did not dig deep enough) power does not pass through the SS to other peripheral sidecars. I am very fortunate to have a legacy games dealer around the bend from my house. I was able to get one of the WICO Joysticks which worked out well
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