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About Dropcheck

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  1. If I remember from the preliminary docs on my site the extra chips were there from the original idea of adding three additional slots, (5 -> 8 ) and providing additional signal buffers. By the time the proto boards were actually made, they had cut down the number of slots, but apparently were still thinking additional signals needed buffering. All of the specs were in constant motion, so it's not surprising that the board didn't quite jive.
  2. Just wanted to check in and see if you've found the time to work some more on this?
  3. At the time I did my schematic, a gentleman from Australia had done a trace of his real 1090 and I used his wiring diagram. So it's possible that we missed a trace or two.🙂 Yea, when I realized I couldn't continue with the project, I went ahead and sold off the extra boards I'd had made.
  4. I would love to check my pieced together schematic against yours. See if I missed something. Probably would be an exercise in humility for me. 🙂
  5. In essence that is what the 1090 expansion box is, with the added benefit of it being adaptable to changing wants and needs. Insert upto 5/8 cards of whatever feature set you want in one chassis. Plug it into your 800XL or 130XE and away you go. The downside to moving everything onto one main motherboard is the lack of flexibility. It might reduce the cost some, but now you have to replace the entire motherboard to get updated/additional features or get stuck with features you don't use or want. Or heaven forbid have a part fail. Don't forget that super motherboard with all the bells and whistles needs a new type of case to allow connection to all the new fangled other devices you can connect it to now. All of these ideas are a trade off in one form or another. Whether you produce a single main motherboard or an add on box, you really only reduce cost by production in the thousands or millions, not the few hundreds likely to be built. 🙂
  6. A lot of people have purposed various designs over the years. The one common thing has been the massive amount of time, money and expertise that is required to bring the 1090 expansion box to fruition. Remember this box was never released to the public as a finished product, so there are a lot of grey areas and gotchas that never got fleshed out. I was working with three other people for a time to create a modified version of the 1090. But then got bit by the time/money/expertise juggernaut. It's not that it can't be done, just that you have to have all three items in spades. Two out of three won't get you there. You also have to go in very defined steps. You can't start with an everything including the kitchen sink approach. Get the basic setup up and working reliably. And then you have to decide how true to the original specs you are willing to stay. Is the Atari computer the host or the client? I wish anyone who attempts to work on this kind of project well. If you need some background I've collected and published what info and work I was able to accomplish here.
  7. Sorry, I did an update to the site awhile back and didn't realize the document tab was gone. Fixed now.
  8. Any official info on hardware based fixes for the SIO/ESP32 interface problem?
  9. Not sure if it was a design flaw in the 1088XEL since other devices prior to the Fujinet's existence worked without issue. Sometimes it's a combination of two different hardware created years apart that combine weirdly to cause conflict. The resistor fix on the SIO2PC should have corrected the issue without removal, maintaining the features of the SIO2PC . But that choice is up to you. 😏
  10. Stephen, that has no place in this forum. That is offensive to me. 😠
  11. The PBI is a 800XL/and some 600XL models only port. When the 130XE computers came out Atari changed the original 800XL PBI port somewhat, making the combined cartridge and ECI ports physically and electrically incompatible. You could usually find an adapter board that allowed most PBI devices to work on the 130XE and vise versa. But not all. On both the XEL and XLD Mytek included the 130XE version PBI which is compatible with any 130XE "PBI" device, assuming you can get it to fit in the case. On the XEL Mytek also included a mini-PBI connector, primarily for the CF3 boards. Third party device creators could also develop for the connector. The Freezer device depending on what year it was made in also came with an adapter board for 130XE computers.
  12. Please take these type of discussions to the proper thread. 🙂 There are several in the dedicated Fujinet section. Or start your own thread. This one is dedicated to hardware issues.
  13. Yes. Although I don't know if you can completely blame the 1088XEL SIO. There's also some other issues with the Fujinet regardless of what Atari computer you connect it too. Right now if you turn off the Fujinet using its own power switch, you often lose the pass through of SIO signals. So if for some reason the Fujinet is not playing nice with other SIO devices in your chain, you're only option is to completely physically disconnect it from the chain. They are working on a fix for that as I understand.
  14. The SIO-Aux only exposes 5 of the 12 needed signals for the Fujinet. It's not a simple cut and paste operation. You definitely would not like esthetics either inside or outside. Your best bet would be to use the external version of the Fujinet with a short SIO cable.
  15. Unfortunately the Fujinet requires quite a bit more circuitry and would not easily fit on the 1088XLD I/O ModSystem.
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