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ChrisXF's Achievements
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That's true, but jp0 doesn't need to be populated: slot 0 is enabled by default, the jumper just controls the lock switch. That said, I did actually try all slots with almost all combination of jumpers set and no dice, sadly. I think the design is almost perfect for the ST: everything is marginal and it's just your luck if it works. 😂
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Does the c128 version handle the 80 column at all? Even though I have a PAL SCART equipped TV, that CGA interface is still a pain in the neck.
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Ah, that's a cool product!! I wasn't familiar with that thanks for posting details. So, I think twisted pair will work perfectly with that - and so will the cables you already have. This shouldn't suffer from any of the common problems that people cite with the Atari video signal. That would be quite a nice thing to incorporate into the motherboard, as the UAV was. 🤔 Add: oh it's a c0pperdragon product? Nice, he makes good stuff. And I see there's an option for Commodores including the c128? I FEEL AN ORDER COMING ON, LOL
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So you've got analogue out the chip to composite, a few CM of cabling and then straight to ADC? Nice! That'll certainly rule out bad cables as any source of interference, and I think upgrading those flying leads to the RCA jack is even less likely to make any difference. Can the upscaler handle s/video output? That should look even nicer.
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I look at the signal on an oscilloscope, and check if it matches the specification for a good signal first. Good eyesight (and other subjective measurements) or not, jailbars are always clear on the waveform view! 🙂
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Maybe be cheaper to cut up an old VGA cable and use that. As long as you find a decent one it'll be internally shielded and 75ohm spec. 🙂 If it's good enough for SVGA resolution and refresh rates it should handle s/video and composite OK.
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We have video issues because Atari's in chip and discrete on PCB video circuitry was designed by someone who's never seen a circuit, or a good video image before. I don't know if it was 'bring your five year old to work and set them free to create' day when most of Atari's video circuitry was drafted, but I suspect it was. Anyways, the proof is in the pudding: Scorpio_ny, let us know the differences you see if you do go for full shielded cable to the RCA connectors? I've got two XE's, one with DuPont patch cable clipped to the motherboard and vaguely twisted, zero shielding anywhere - and one with a full case, sheilding on, and nice coax from the din connector - and I can see nada in the way of quality difference. YMMV and I'm curious.
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I feel for the two or three centimetres were talking, cable selection is going to make zero difference. At that length some wood screws would have the same image quality, as long as ground is preserved. 🤣
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Put the cables in a drill and twist them together tight, just before they start to double over on themselves. For short runs like this its not bad poor man's sheilding! 😁
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Oh great work, I like the securing screw design!! 😁
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If I was super interested in investing the time I'd take the blue pill from the working card and graft it onto the not working card and see if it worked then. I think the most likely problem area is that blue pill. With so many knock offs floating around who knows maybe I got a dud even though it passes diagnostics and seems to work? To be honest that whole 'pill' ecosystem does itself no favours: so many variants, so much nonsense online, confusing and contradictory ways to program the thing, procedures that need specific variants of the support software to work but that's not mentioned, etc etc Of course that could all be a 'me' problem rather than an actual problem 🤣🤣
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Right sitrep: I was kindly sent another version of this project, pre-built by masteries. It works perfectly! I had a look over the design of his version and it has a few subtle differences from the open source variant: like properly matched pull up resistors for the SD card which also has its own vreg. So far it works with every single SD card I've sent its way, and it was sent to me with proper documentation and no guesswork required. The version I built I went over with a fine tooth comb and eventually concluded it wasn't worth my time trying to get it to fly right. Could have been a faulty blue pill, a bad PCB, or the design is just trash, I don't know. 🤷 I think the open source version is very much like the ST itself: maybe works... sort of, but precariously balanced at the very edge of works/doesn't. Anyways, I've got the ST on the go now and playing a few of the old games I remember. 😄 My luck of course, bombjack isn't one that's included on the complication for SD that I got, damn, lol
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Yeah I can't really comment on the modification, my board revision was the latest and had those fixes integrated. As for the composite on UAV, I've actually seen better video from the stock circuit on some TVs. Some TVs like stock luma and UAV chroma or vice versa too: it's worth some experimenting. Seems counter intuitive but it's been my experience!
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The original Atari BASIC mask ROM won't work, even though the board is silk screened for it - at least I couldn't get it to work and was advised to not try. Burn up a standard EPROM and use that instead. The issue with composite jumping sounds a strange one, if you select the jumpers to not route it through the UAV is the image stable? If so, check voltages on UAV and if not check Atari video chips (gtia, etc)
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Tried em all, individually and in groups. Yeah, that's a bad angle / flash on the shot, none of the pins are shorting out