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Everything posted by anthon

  1. I have developed an adapter for using USB keyboards and mice over ADB. View a video demonstration of the prototype below. It is powered by the ADB bus and hosts USB keyboards, mice, and hubs. The production version will have an integrated hub with two ports (one keyboard, one mouse). The prototype is functional, but there is a lot of work left to do. Designing the PCB, implementing some additional firmware features I have planned, designing an enclosure, implementing a test suite, etc. Expecting to be able to ship them in 1Q 2017. Demonstration video
  2. By "sample" do you mean "recording"? As discussed previously, it makes far more sense to me to synthesize the audio with a DSP. On a Mac SE, Classic, etc. there is little to no difference in performance between an HDD and a SCSI2SD due to the 53C80 controller being so slow. For a machine with a faster scsi controller, only a representative sample of operations would be synthed. The firmware would have minimum and maximum lengths for synthed seeks, reads, and writes based on real scsi drives. If the operations are too fast, then it would discard operations to meet the time constraints. Another option might be to slow down the flash speed for a more realistic retro experience.
  3. I have pivoted the project in a different direction. Keeping quiet about it until it's ready, because knowing me, it could be a while.
  4. If one follows the suggestion to use netatalk, then the resource forks are just extra files. You would just commit the resource forks like any other file in git. It does mean though that anyone using the repo would need to have a way to do the reverse operation. There's probably no way to avoid that.
  5. It's almost the same as USB Wombat. The primary differences are : * ADB Busboy has 2 USB ports * ADB Busboy only allows you use USB peripherals on ADB computers, not the opposite. * ADB Busboy has better power protection between the ADB host (computer) and USB bus.
  6. anthon

    Massive PC/XT/AT & Apple II haul

    This site looks like it's dead now. Maybe they need to pay their hosting bill.
  7. anthon

    LCII Buggered C14 plus side...

    I just pulled out my LC II and verified it against the real board too.
  8. anthon

    LCII Buggered C14 plus side...

    According to the BOMARC schematic, C14 is connected to pin 7 of UB9.
  9. anthon

    Macintosh IIsi

    The eyes follow the cursor around and occasionally blink. That's all they do. There were a lot of silly programs like this back then.
  10. A related topic came up in IRC today so I figured I should really post an update. I solved the unreliable behavior with daisy-chained hubs. Some USB devices draw a lot more inrush current than others. Adding a capacitor to each port solves this problem. I redesigned the PCB to be about 40% smaller, switched to an RGB status LED, upgraded the ESD protection diodes, and probably a couple other things I have forgotten about. I haven't ordered this new board yet. I want to review the layout again first. When I will get around to doing that, I don't know.
  11. anthon

    Adb busboy 2017 11 06

    From the album: ADB Busboy

  12. anthon

    ADB Busboy

  13. anthon

    Board Cleaning - Techniques - Chemical Reactions

    I did the litmus test a while back. I decided that vinegar was the appropriate opposite pH range, so the goo must have been alkaline. I only did one sample, so YMMV.
  14. anthon

    Board Cleaning - Techniques - Chemical Reactions

    Ultrasonic cleaning is definitely the way to go. Wish I could afford one large enough for logic boards!
  15. The photo on the AllMacs ebay listing shows that they used through-hole capacitors. Not a good sign, IMO.
  16. anthon

    Old Mac, Modern Internet

    Someone is doing that, but with gopher instead of AOL: https://68kmla.org/forums/index.php?/topic/30788-gopherserver/
  17. anthon

    Adding Wi-Fi to my Mac SE/30

    This is a really good write-up. Nice project! The access point switcher should be fun too.
  18. anthon

    Macintosh SE/30 list of capacitors

    I maintain a list of replacement capacitors at https://www.hobbesnet.org/wiki/macintosh:logic-board-capacitors. I have links to specific part numbers I use. I only have part numbers for aluminum electrolytic and aluminum polymer. These are more difficult to solder than tantalum (mainly due to the very small leads). I haven't been convinced that tantalum are better for this purpose. Ease of soldering might ultimately be a big enough factor to tip the scales in my mind. For now I'm sticking with polymer though. Some day I will figure out the best sizes for tantalum replacement parts for comprehensiveness.
  19. anthon

    SE/30 Grayscale Project: 640x480 @4 bit or 8bit

    This seems to imply a 720x350 resolution.
  20. I use Keystone part number 108 (battery holder) and 108C (cover). https://www.digikey.com/product-detail/en/keystone-electronics/108/36-108-ND/275347 https://www.digikey.com/products/en/battery-products/accessories/87?k=keystone%20108c
  21. No, the SE also has a clip on the logic board connector (J12).
  22. All of the aluminum can capacitors are bad. C1, C3, C4, C5, C6, C7, C8, C9, C10, C12, C13. The first photo ben68 posted is what I see all the time (and when I say "all the time," I mean every single board I look at): corroded pads, corroded vias, corroded pins, eaten away traces, all swimming in a bath of goo. I think it takes a little bit of experience to recognize the goo. I had trouble seeing the mess of goo on the first couple boards I looked at. Using a flashlight helps. And if you wipe a cotton swab with alcohol over the board next to those caps, it will come away yellow/brown.
  23. I have never seen a soldered black varta leak, but I cut them out anyway. I suspect that the leaking and corrosion on the SE/30 is worse than you give credit for. I haven't seen an uncapped SE/30 in the last couple years whose life wasn't hanging by a thread. That corrosion is permanent damage and makes it a lot harder to recap. And it will proceed for as long as you procrastinate dealing with it. Forget the floppy drives. Get that logic board washed and recapped. If you're not misjudging the extent of the cap damage, you have a board in uncommonly good condition and should preserve it pronto.
  24. Yes, the computer will run fine without the battery. It won't remember the date and time or a few other settings, like audio volume.
  25. anthon

    SE/30 Intermittent Twitching Screen

    They are helpful documents and I appreciate your effort. We should consolidate them somewhere central so that they're easily found and referenced. I hope you continue to contribute these resources and don't let my comment discourage that. I just wish we had a better organization system.