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Ianr757

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  1. hmm, no dice. I lifted pin 13 from the TIA (so that it is no longer in circuit with the motherboard, as done by epp) and soldered it directly to the audio jacks via a wire, and no sound. Since you've mentioned you don't remove the RF modulator, is there cause to believe that removing it (as I have done) would lead to a lack of audio? Thanks.
  2. Thanks for the tip! Unfortunately, it didn't solve the issue. I still don't have any audio. I am absolutely positive the console itself does not have any problems, as the audio worked on RF. I have done tons of AV installs and a drop-in s-video install, all without issue, but this UAV is so stubborn. Any other ideas?
  3. Hey all, I just installed the UAV basic kit on my 2600 4 switch woody. The s-video works great, but the composite video signal is poor, and there is no audio when I try to connect a wire from the empty joint at C208 into the two audio jacks. Interestingly, when I plug in a cable into the old RF slot on the main PCB, the video improves. I'm not sure exactly why, and it doesn't matter what cable I plug in, just as long as it goes into the TV (for example, into the coaxial input). Grounding issue? I have attached pictures showing the difference (+ cable, - cable). I followed the wiring diagram made by epp for the video. Regarding audio, I know sound works on this console, as it worked via RF. Would the UAV wiring be causing an issue? Thanks for the help.
  4. I feel like there is virtually no difference between this and another already existing game, Squish Em.
  5. Okay, so I added a 2N4401-ND transistor to the circuit, and now the video is much brighter. Is there any reason as to why this could cause issues in the future? Thanks.
  6. Hey guys, figured I'd post this here since it is technically an Atari 2600. I've been trying to mod my Gemini using a standard 2600 composite mod kit, following the instructions seen here: However, the video is super dark, as in barely visible. I tried removing certain components as described, but nothing helped improve the picture. Q3 is still removed, but it makes no difference in or out. Any ideas on where to start? Thanks.
  7. There shouldn't be any problem with using either one. However, I can only vouch for the one you have pictured, sold at the provided Ebay link. I've bought several of these and they work fine. I would be careful buying anything coming from China, though, as I have heard stories of similar ICs (such as the TI99/4a's TMS9918 chip) being purchased from China and not working:
  8. Yup, that's where I buy mine from. You should buy a heat sink for it too, as it tends to get hot, and some thermal glue to tack it on: https://console5.com/store/thermally-conductive-heat-sink-adhesive-glue-gd9980-10-grams-10g.html https://console5.com/store/dip40-super-heat-sink-glue-on-thermal-epoxy-style-dip-40.html Also, you are correct, that NEC chip is the CPU.
  9. If you can solder and have the means, preferably a desoldering iron, you could try replacing the VDP (it's a TMS 9928 chip, easily found on Ebay). That will at least rule out or solve the issue.
  10. @Ruggers Customs Success, it's alive! Turns out the original VDP was fine, just the Z80 and maybe the RAM (which was going to be modified anyway). Thanks so much for the help!
  11. Aha, I was leaning towards the Z80, just didn't know if it would make a difference since the expansion module works. Thanks for the tip! And yes, the power supply is just fine, so it must be the Z80. I'll swap it out and report back.
  12. I just got in a nonworking Colecovision that I thought I'd try and repair. Upon initial inspection, the console would power on, but the screen was black and there was a hum/sustained beeping noise every other power cycle. I tried the Atari expansion module and it worked fine, so I thought it was going to be either the RAM, VDP or both. Well, after replacing all RAM ICs using the 5v memory mod, and the VDP with a spare, it still has not improved. Any ideas of where to go next? Thanks!
  13. Thanks for the information! Well, once you have some time for it, I would love to get one to try out. Just let me know please!
  14. Having done a few of these mods now, and also having recently tried out an old component mod by 8bitdomain which left a lot to be desired, I'm wondering, is there any way to do an RGB to YPbPr conversion inside the console itself, kind of like the kit available for the NESRGB?
  15. So did this guy just fall off the face of the Earth? Seems weird that he was so active in the community and then just disappeared.
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