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mytek

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mytek last won the day on September 26 2020

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About mytek

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    River Patroller
  • Birthday 02/28/1956

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

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  1. 2 ma at 2V over spec isn't going to hurt anything as far as I'm aware. I think I know why you are so interested in this circuit . EDIT: if you are still feeling uneasy, simply up the series resistor from 4.7K to 10K or more, it should still work.
  2. Well considering that the original charge pump circuit can do close to 9V, that already exceeds the presumed 8V maximum. But keep in mind that both the stock Atari circuit and this one are severely current limited, this one with the series resistors. Maximum current available is 2 ma which shouldn't exceed the current handling of the GTIA's input clamping diodes. Of course if you have the pot set to the extreme end to produce that amount of current, you will also have some very strange colors . The circuit as shown produces pretty close to the correct color with the trim pot at its mid position, so that's where the pot should be initially set. BTW, the LM4040AIZ-10.0 limits the available voltage to 10V prior to the 4.7K series resistor.
  3. Hello Mike how are you doing

  4. I just thought I'd add that the NUC-FujiNet V1.5 prototype schematic that I posted both here a while back and in my blog, should not be confused with the V1.5 'Stock Atari' Fujinet hardware being discussed by mozzwald's latest post. They are two entirely different boards for two entirely different applications. However thanks to mozzwald's help and code changes both independent designs are benefiting from the new features he mentioned for V1.6.
  5. Yeah it's a extremely accurate digital multi-meter which I'm glad to own. Traded a 35mm Nikon SLR with motor drive for it about 20 years ago, and never regretted that decision.
  6. Here are my test results using 1.2K and 2K (both 1% tolerance) in voltage divider with latest firmware release. It's way better than before, being within 3% of actual. I'd say pretty darn close and call it a day. Thank you . WEB UI ACTUAL SIO VOLTAGE (being tested on a 576NUC+ which sees some voltage drop due to the filter circuit and the power MosFet switch) VOLTAGE DIVIDER OUTPUT
  7. Don't forget Lexus 🤐 . Sorry but if we are going to be all inclusive, I had to add what I drive now (of course this will start a new round of bashing centered around US vs. Japanese cars ). Yes, yes, and yes!!! That is what we should be doing 👍
  8. I've been watching this from the sidelines and have got to say I certainly understand where you are coming from. It's truly sad that in this day and age, some 30-40 years later that we continue to see people unable to accept that all 8-bit computers have their merits, no matter the brand. And that although the Atari did some great things with their hardware design for the day, they weren't the only ones that did . Be nice to share and make comparisons between the brands without it always having to go down this same road.
  9. I would if I could but I'm 150 miles away from home and won't get back until Wednesday night. But first thing in the morning Thursday I'll give it a go.
  10. I'm sorry to hear this . Just a bit of unsolicited advice: you might want to look at the original published 1088XEL schematics on my website as a reference, since those were verified, and there are a multitude of working boards out in the wild to prove that out. Edit: if the Eagle schematic was the one I also recently posted a link to on my website, please keep in mind that no boards were ever designed from that schematic (same goes for the KiCad one as well), so those should be treated as unproven. BTW, if your board layout had been perfectly correct on the first attempt, that would've been quite remarkable, but also not something I would have expected from my 1st attempt. Usually it takes me 3 tries to get it completely right in all regards (the 576NUC+ took 4 tries).
  11. Sorry I've been gone for a while and just saw your new posts a little while ago. So coinciding with this I also assembled a V1.5 NUC-FujiNet prototype board which incorporates the card detect switch connection, flashed it with the new firmware, and then started testing. Good News!!! It works as advertised each and every time I hot plug either the same card or swap it with another while the system remained powered up. This is a very slick feature, thank you 👍 Let me know, and I'll change my divider values, and give any firmware updates a test.
  12. Forth is so bizarre, but also very cool from what I've seen. Someday I really want to take a deep dive and try to learn it, because I find it fascinating. Good luck with the project Thom, I wish I could help, but it's way beyond my gray matter presently.
  13. Unfortunately it won't. The problem is usually attributable to the chroma and luma signals mixing due to no individual shielding to stop it.
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