Jump to content


  • Content Count

  • Joined

  • Last visited

Community Reputation

239 Excellent

About juice2839

  • Rank

Profile Information

  • Gender
  • Location

Recent Profile Visitors

2,914 profile views
  1. This is interesting. The juicebox does not draw much power at all. Maybe a few milliamps more than the Opcode SGM. If you PM me I would like to figure out why it's not working on one of your CV's and the Opcode does..
  2. The EVE sits in a full metal can away from the Adam. Basically in a faraday cage. That is one way to deal with the noise produced by the Adam. Another thing to note; I pulled out my trs80 color computer and speech sound cartridge. This uses the exact same speech and sound chip as the say game. It produced the exact same type buss noise on the trs80...
  3. I have spent the past few days fully analyzing the noise levels and signals coming from the speech game module, Coleco and Adam. Here is the technical details of that analysis. Unfortunately some people could not appreciate that it would take a little time to analyze things and demanded immediate action.. The colecovision and adam were designed and built in the 80's. The pcb's do not have ground planes and they are inherently noisy. If you turn up the volume on your TV with nothing plugged in you will hear the noise. They used 2 metal plates on the top and bottom to effectively make a ground plane. If those are removed the noise is worse. I suspect that is the case with some of you with more noise issues. The noise you are hearing is called buss noise. What this is .... is just what you'd think it is. It's the sound of the data and address lines changing from 1 to 0. If you listen close you can hear different frequencies and not noise actually. That's the sound of the CPU doing it's thing. The AY-3-8912 has a low impedance output with a level of 1 VPP. When this signal is fed directly into the coleco or adam it is relatively noise free because there is no amplification and the buss noise gets drowned out. The speech chip on the other hand has a very high impedance and low output voltage. This device must be amplified. The op amp amplifies the speech chips output by a factor of 10. When this happens the buss noise is also amplified. This is not a defect in design nor a ground plain issue with the speech game module. This is inherently a problem with 80's technology. The fact is most of you probably don''t remember the 80s or maybe you were not there, but this was how the hardware ran.. Now I understand it's the 2010's and everyone expects crystal clear fiber optics quality sound.. There are 2 ways I see this buss noise can be reduced. one is to make sure all your ground plane metal plates are installed and your capacitors are all good on your Coleco and Adam. The second is if you are only going to use the AY sound and not the speech you can disable the op amp mixer. If anyone has any questions, needs help or wants more information you can PM me. I'll do my best to help and explain. I hope this clears up some concerns. Thanks, Fred
  4. It's extremely rare (IE: I have never seen a bad filament on a vectrex and I have worked on more than I can count). Again I suggest you get the logic pcb working then go from there. If your not getting anything (dead) try the ay-3-8912 sound chip first. If this chip is bad you get no video, no sounds and no joysticks. I have seen this fail a few time with your symptoms. If you get it to play blind then you can go from there and get your display working. I have a spare CRT I'd part with if you indeed needed one, but I bet you don't.
  5. I made some with smt and high quality PCB's.. http://www.ebay.com/itm/182012540398?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
  6. This is the assembler I used to assemble the code above... AS80.rar
  7. I think it could be done with a little investment and time. I would start out making a prototype with something like an Arduino Nano and sd card reader. The tricky part is probably figuring out how the data is transferred with the tape drive and making an interface to mimic it, but if I found some other people that knew some of the technical side to the Adam it would be a project I would do...
  8. The more I look into the Adam the more I like it. If there is enough interest for adam devices I might work on some if not then I intend to play around with it just for my own curiosity.
  9. This is the speech test bin padded to 32k so you can try it on an AtariMax. After 12 seconds the intro goes black and you will hear "Hello Started and Ready" and some more phrases then it repeats.. testcv32k.BIN
  10. Right. I have never used a screwdriver to ever pry them apart. You just pull on the front and it will come apart. over the ridge. He makes it look like a struggle.
  11. Is it just me or does this not look like the easiest way to open your Colecovision.. I got a good laugh out of this for some reason..
  12. LOL Actually it uses Allophones so you could probably make it speak a few different languages...
  13. The PSG is connected to a port address and not a memory address so something in the special adam may have something already assigned to that same port address.
  14. AHH finally I see... I think I know what's happening. The software checks for the PSG by looking poking around and looking at the AY-3-8910 registers. For some reason the special adams happen to give the result the software is looking for. I'll have to look at the Nanochess code to see exactly how he is testing for the AY-3-8910 then we can determine why some adams work and some don't.. But it comes down to a false positive from the special adams for the presence of the PSG. Technically all the SGM games will run on any Adam as far as I can tell as long as you either disabled the PSG test or hooked up a PSG to it.
  • Create New...