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mytek

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mytek last won the day on April 2 2019

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About mytek

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    River Patroller
  • Birthday 02/28/1956

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    Releasing Magic Smoke
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    Male
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    Santa Rosa, CA
  • Interests
    Electronics, Computers, Cryogenics, Embedded System Design

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  1. That card is 50 MB/Sec one which will not work with the SIDE2. Preferably you should stick to cards rated for <= 30 MB/Sec. However with that said, that card will work in an XEL or XLD, and does so quite reliably albeit without the ability to hot plug (meaning don't try inserting it after the power has already been applied).
  2. 16GB is not too big, but the speed rating of it might be too fast for the SIDE2, or it just doesn't like that particular card (some manufacturers are not supported). Can you take a picture of the CF card and post it here?
  3. And to add to what I wrote... The PBI should be fully buffered which takes 3 chips to do. Because a non-buffered system bus heading out to the outside world is quite ridiculous and just plain poor engineering. All to save about $2 😕 .
  4. Simius that is a very reasonable price. Put me on the list for at least one to begin with (VGA desired -- will be going in 1088XLD). Can you provide details on the video monitor connector interface.
  5. I think we'll likely de-laminate and fail way before our Atari's do 🤔 . So this brings us back around to a 1088XLD with a new layout having all the connectors located to mate up with all the original holes in the 800XL case, and implementing the card fingers for PBI. With careful arrangement of Sally, Antic and the GTIA, modern upgrades would fit with ease. And the XLD design already incorporated headers with the prerequisite signals for these upgrades. Plus the U1MB plugs right in with no soldering or cables what-so-ever, MIDI and a built-in MIDI Synth is already supported if so desired, along with enhanced UAV standard video, which is also a wireless no solder plug-in. Built-in IDE is there as well. Probably want to change the design to use a PokeyONE instead of the dual Pokeys, which would also yield more board space for other things. And while you are at it, building in FujiNet would be the ticket. Another option would be a redesigned Eclaire motherboard in the 800XL footprint. Unlike many years ago where stuff like this was bantered around, but no one could be bothered to draw up a schematic or prototype a design, we now have proven well documented examples --- essentially creating a road map. And I know there are many others out there that have the PCB layout skills required for such a task, some much better than I. So all it takes is for someone to step up and begin the work. Anyone ready to rise to the challenge?
  6. Fantastic 👍 😍 Of course this will obsolete my RGB2VGA board, but I really don't mind since this promises to be a much better, cleaner, and more flexible solution. Now I just need to develop a new jack solution for the XLD that'll mount in the the redundant SIO position. So how many $$$ are we talking about?
  7. Yes I think that's exactly what's going on here as well. Apparently it's only their name that's being used, with someone else actually footing the bill and running the operation. Atari the name is just being slapped on it for promotional effect and nothing more.
  8. I wouldn't expect it to happen any day soon, just look at how the new Atari VCS has been delayed over and over again. And then I have to ask where do they plan on getting the money to do this? Because they can't even bring out a game console without making it a kick starter project (or whatever the name was of the crowd sourcing). Sorry to say I don't think you can build a hotel with crowd sourced money.
  9. On your first post you mentioned the possibility of going with a 5" display for this portable Atari. Just trying to scale the size of the main board in my mind, and that seems like that would work well and not be much bigger than the PCB. Can you share the dimensions of both the main board and the keyboard? BTW, that keyboard is looking real nice, can't wait to see it with the 3D printed key caps.
  10. Thanks for detailing all of this Herb 👍 . And to avoid any confusion, on all my schematics I use the following abbreviations for the clock signals. PH0 = Phi0 PH1 = Phi1 PH2 = Phi2 B02 = Buffered Phi2 via single gate in 74F08 high speed quad AND gate PH1 is used to drive a voltage doubler circuit for the Color Adjustment POT, so I'm pretty sure part of the reason it might look less than ideal on the scope would have to do with the loading and capacitance of that circuit.
  11. Chevymad can you post a close up picture of just the IDE section on your board.
  12. In the XEL (and the same for a stock A8) Phi1 is used to generate a voltage doubled output for the color adjustment POT (check out the video section in the schematic).
  13. My initial reply is that is not logical. Bringing U25 pin 4 high should have completely taken the decoder out of the loop, basically the same as if you removed the chip. The only exception is that removal of the chip allows everything connected to its outputs to float. But with it responding like that, there's really nothing else I can recommend at this point, besides blow some magic dust over it and see what happens. I know that's not the response you would like to hear, but with U25 defying it's own operational parameters, and the fact that you said you substituted another decoder earlier in the troubleshooting stages with no difference in results, means there really isn't an answer for what you are seeing. If you look at the logic diagram below, you'll see that pin 4 = /E1, and if that input is high (1st line in chart), then it doesn't matter what any of the other inputs are doing, because all of the outputs will remain high irregardless. So in other words, nothing will be selected (all decoded states are active low). And since you don't have a CF card in play, there are only two outputs that can even influence anything (pin 10 & 11 of U25). One of those is for resetting the Swap Latch, and the other is for reading the signature and status bits (D6 & D7). Both of those require that there respective connection to the decoder goes low in order for those operations to be carried out. Oh there is one more thing you can do just to rule out the decoder as a problem... Bring pin 4 of U25 high once again and then take voltage readings on all the outputs. They should all be in a steady state of high (+5V). If any are not, something fishy is going on.
  14. Was this been tried yet? This would be the easiest way to completely take the 74F138 decoder out of the mix, while still leaving all of the other components including the decoder still in circuit. If this allows everything to work other than the IDE, it would really narrow down the search for the problem.
  15. As long as you are having fun and not cursing at me for inventing the thing that is giving you so much trouble, I'm perfectly fine. Yes that is odd. Perhaps without a connection some sort of strange back feed is occurring between the transistor and the diode, since the transistor is being switched on because of the stuck Swap Latch. Normally when connected, and assuming that the decoder is working properly and connected, you would have 5v present that would inhibit that. And yes perhaps the back flow is in the opposite direction then what I just described . You're welcome 👍 .
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