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About slaanesh

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    Star Raider

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  1. Hey @Wrathchild that's looking pretty good. It's been a while since I posted this topic and it's also been a while since you posted the demo. Has there been any update? If you need a tester I'd be happy to do so, I can run it on real hardware both NTSC and PAL on my Atari 800XLs.
  2. I'm just trying to troubleshoot my Atari 400 and adding a 48/42K board. I replaced all the caps on the power board and a single cap on the motherboard - but I found out there is this extra cap underneath. For completeness, I want to update it with a modern equivalent... does anyone know what the rating of it is?
  3. I recently replace all my caps on my Atari 400... Does this type of cap also need replace like the electrolytic ones? If so what specs is this thing? And yes, I also have this cap on my motherboard
  4. I've tried a number of things including removing the ROMs from the Atari 400 board and using the 48/52K ROMs and the reverse as well (and setting the jumpers as required). But to no success. So at the moment, I am not using the 48/52K board. Is there anyone else (apart from @jamm) who has the tf_hh 48/52K board and it's not working reliably? I mean the actual board is excellent, it's just in combination with my particular Atari 400.
  5. So I got the replacement power board and it's absolutely no different. I basically can't get the RAM board to work with my Atari 400. The guy that does the 48/52K memory boards graciously even sent me a second board which I tested with exactly the same results. I ended up paying him for the second board anyway as I thought maybe the original was faulty but it wasn't. When I remove the 48/52K memory board everything works 100% all the time. Putting the 48/52K memory board back in results in a computer that only boots sometimes. Same for both boards. I give up! So it's back to a 16K Atari 400 and I have 2x 48/52K memory boards... and a second power supply... and a second CPU board! The UAV video board and the internal sound amp are the only mods in the computer and it works a treat like this. Great picture! The only thing I haven't tried is removing the UAV mods and see if the 48/52K memory board works reliably without them... but that defeats the purpose for me. If I can get another Atari 400 I will try it again. But I don't really need/want another but if another does come up I'm willing to try again.
  6. Wow what a great game! This is one of the best Atari 2600 games! I played a lot of Galaga - mainly on the arcade version - but this has the right "feel"... one of the best home versions of Galaga on any platform.
  7. So I removed the 48/52K memory board and replaced it with the original Atari 16K board and everything is working again. The AV mod works fine and the computer boots up every time. So the power board was fine all along. The new power board is also fine. The issue seems to be with the 48/52K board. I was very careful with all aspects of the mod and I have no reason to believe that I damaged it. Anyway I am getting a replacement board so will see if that fixes the issue and will report back my findings.
  8. The 2800 is actually no big deal. I also have a Sears Video Arcade II and there is literally no difference except for the badge. That's it.
  9. Hey awesome and of course, this mod will also work for Atari 2800 as it's the same thing. In fact that's what I actually have
  10. So in the end I used a Longhorn AV mod which also does s-video. I used the instructions found here: https://longhornengineer.com/category/projects/atari-av-mods/ However it looks they've since disappeared. I think you can find them from the Internet archive but if you can't I saved them so can re-post it...
  11. Okay well that really would exactly explain the readings I am getting. I'm thinking that both of my power boards are actually fine.
  12. Original power board: Pin 1 has 14V input Pin 3 has 11.96V output New power board: Pin 1 has 14.06V input Pin 3 has 12.5V output
  13. So what I mean is that when the power board isn’t connected to the rest of the computer, the 7805 is measuring about 10V on pin3 output pin. The 7805 is on the outside of the heatsink and pin 3 is on the right hand side. Please correct me if I’m wrong.
  14. So I have a new power board. Before using it I checked my power supply to make sure that it was providing a good constant 9VAC. It's actually providing bang on 10VAC which I thought was probably right to allow for voltage sag under load. So I connected it up and then measured the 7805 and lo and behold... it's way higher than 5V again... like WTF? This is without the board connected to the computer. I mean surely this board couldn't have the same fault as my other board? Or this is actually correct. When the board is NOT connected, that pin is delivering more volts. Maybe it shouldn't actually be powered up without having any load? Anyway, I'd really appreciate if anyone can verify what the voltage on pin3 of the 7805 is under these conditions.
  15. I’ve double and triple checked the mods and am sure they are good with no spillage, bridges or misconnections.
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