Rick Dangerous Posted May 14, 2014 Share Posted May 14, 2014 Hey peeps So I have a 7800 PROsystem AV Modded by Electronicsentimentalities and last night I was playing more or less my whole library of 7800 games. They were all coming out of my stereo speakers as beautiful unique channels. Then I popped in Ballblazer, and my sound was left channel only.. Has anyone ever heard of this happening? Is it just Ballblazer, all pokey chips, or perhaps a freak side effect of the AV mod? After Ballblazer I played a few more games, and back to stereo with no issues. ?!? Any input would be appreciated, Thanks. Quote Link to comment Share on other sites More sharing options...
Rybags Posted May 14, 2014 Share Posted May 14, 2014 Pokey has just the single audio out pin. Stereo Pokey generally refers to using more than 1 chip which is default for some arcade games and a popular modification for the 8-bit computer but AFAIK never done on a 7800. As such, it would seem logical that an AV mod for the 7800 would take the external audio input from the cart port and pipe it to both sides, not just the left as seems the case here. Quote Link to comment Share on other sites More sharing options...
Rick Dangerous Posted May 14, 2014 Author Share Posted May 14, 2014 Hmmm... I am at a loss then since the other games work so great. The mod I had done is apparently known as the LHE mod. Might this have anything to do with it? It's really not a big deal if I wanted to have a "Ballblazer tournament day" I suppose I could just slap in a Y splitter for that left channel. Maybe the chip in the Cart is broken? I bought it new in box but I suppose anything is possible. Quote Link to comment Share on other sites More sharing options...
Rybags Posted May 14, 2014 Share Posted May 14, 2014 The Pokey chip in the cart isn't broken. Like I said, only 1 audio pin from Pokey and it carries all 4 channels. NTSC TIA has 2 audio pins, 1 for each channel. All the other games work great because they all use TIA sound. Ballblazer is one of few games on the 7800 which uses a Pokey chip. Is the mod something premade which you buy and install, or is it selfmade from instructions? The fix for the Pokey sound should be simple, you just need to pipe that external audio input to the right channel as well. Quote Link to comment Share on other sites More sharing options...
Rick Dangerous Posted May 14, 2014 Author Share Posted May 14, 2014 I'm not sure this gentleman did it for me: http://electronicsentimentalities.com/InstallationServices.html I'm wondering if flipping the TIA 9 switch might make a difference. I'll have to go home and try that today. Quote Link to comment Share on other sites More sharing options...
AtariBrian Posted May 14, 2014 Share Posted May 14, 2014 Your not sure ? Flipping the TIA wont do anything for that issue . Did he not make it dual mono ? I bet if you play Commando you will have the issue where the gunfire is really loud and you will barely be able to hear the music . Quote Link to comment Share on other sites More sharing options...
Rick Dangerous Posted May 14, 2014 Author Share Posted May 14, 2014 All the other games I play are very clearly in stereo. Hmmm. Like I said not a big deal, I can throw in a Y splitter for epic Ball Blazer sessions lol. I don't think it's dual mono because I specifically asked him for distinct stereo, and it sounds awesome(!) on all the other games.. Quote Link to comment Share on other sites More sharing options...
PacManPlus Posted May 14, 2014 Share Posted May 14, 2014 I actually don't see how you *could* get stereo from the Pokey without messing up the TIA sound. If you force Pokey to both channels, I'm pretty sure that would make the TIA sound mixed as well (i.e. no more separation) because they share the same output. That would be mono sound split into both speakers for everything. That's how my output is, although personally I think that's fine. Quote Link to comment Share on other sites More sharing options...
Rick Dangerous Posted May 14, 2014 Author Share Posted May 14, 2014 (edited) Okay so basically I gave up pokey dual mono (and tia dual mono) to have Tia stereo. I can live with that... Edited May 14, 2014 by travistouchdown Quote Link to comment Share on other sites More sharing options...
iesposta Posted May 14, 2014 Share Posted May 14, 2014 Okay so basically I gave up pokey dual mono (and tia dual mono) to have Tia stereo. I can live with that...Yes. This exactly.All mods I have seen for the 7800 are 1 channel, probably to keep the sound level of the pokey chip and the sound level of the TIA chip similar. Also TIA stereo involves lifting 2 TIA pins, which is easy if it is socketed, and it usually is not socketed on the 7800 so you need to cut them or cut traces. I like the 2 channel stereo separation better, and if I want the same sound from both speakers I use the audio controls of the tv or stereo system to switch to mono. Why go and find Y cables? (Unless what you are playing on doesn't let you switch to mono.) Quote Link to comment Share on other sites More sharing options...
Lynxpro Posted May 15, 2014 Share Posted May 15, 2014 (edited) It would be interesting to see what type of mod could be done for a 7800 with an XBOARD present since it has the option to connect 2 POKEYS inside the console... Granted, there's probably very few of those units out there... Edit: I'm surprised nobody's [that I'm aware of] brought this issue [messed up non-TIA audio] up with the XM since the XM only has a single POKEY - plus the YM2151 - and has been tested with AV Modded 7800s. This should be an issue on it with Beef Drop, Commando, Ballblazer, and several other home-brews on AV Modded 7800s, I'd presume. Edited May 15, 2014 by Lynxpro Quote Link to comment Share on other sites More sharing options...
ataritiger Posted February 17, 2015 Share Posted February 17, 2015 (edited) Damn. My car broke down on the highway. It is very cold out. Got home, moonshine timed myself up. Ahhh, good to go. So, the Atari 7800 is basically a dual mono or single overall mono factory preset type system. With a mod though,http://www.ebay.com/itm/Atari-7800-AV-Mod-Board-S-Video-Composite-Audio-Out-/291375842395?pt=LH_DefaultDomain_0&hash=item43d75a845b The TIA could be made stereo or at least dual mono if the 7800 was just overall mono to begin with? Ok I just noticed if I add a link on this forum then keep typing even with spaces after it, the post becomes a mess as the link connects to what you typed after it once you hit post message. Sigh. Ahhh, after a glass of moonshine, I just decided to take a picture of my post before I posted it. I asked a question in the picture, well my original post, here at the bottom of the picture. Edited February 17, 2015 by ataritiger Quote Link to comment Share on other sites More sharing options...
Trebor Posted February 17, 2015 Share Posted February 17, 2015 Question (verbatim): "...Will the XM have composite video AND S-Video as well as a left/right white/red rca jacks for dual mono or stereo output in the rear the of XM add on" Answer: None of the above. The XM does not provide console output options. Quote Link to comment Share on other sites More sharing options...
tep392 Posted February 17, 2015 Share Posted February 17, 2015 Question (verbatim): "...Will the XM have composite video AND S-Video as well as a left/right white/red rca jacks for dual mono or stereo output in the rear the of XM add on" Answer: None of the above. The XM does not provide console output options. Thought I should add the technical reason for this. The XM plugs into the cartridge port, which does not have pins with audio or video out. Only audio in. So the XM cannot output audio or video that originates from the console. 1 Quote Link to comment Share on other sites More sharing options...
ataritiger Posted February 17, 2015 Share Posted February 17, 2015 Thank you Trebor and Tep for your fast and direct answers to my question. Always appreciated. Quote Link to comment Share on other sites More sharing options...
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