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aperezbios

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Everything posted by aperezbios

  1. Nice. Thanks for this. In doing some further reading, I came across the following additional Apple developer resources, which delves further in to the subject of on-disk HFS structures: Inside Macintosh: Files / Chapter 2 - File Manager / Data Organization on Volumes Some of the same text is available in PDF form at Pages 55-~70 of this Apple PDF (which is also attached to this post) InsideMac-ChapterTwo_File_Manager.pdf
  2. Yes, if you feed 12 volts DC to pin 25 of a SCSI2SD V5.5, you will release the magic smoke. There's probably a place you can pick off 5 volts DC from the Dove board itself.
  3. Description AAUI AUI control in circuit A 5 2 data out circuit A 9 3 data in circuit shield shell 4 data in circuit A 2 5 voltage common 4 6 control out circuit shield shell 8 control in circuit B 6 9 data out circuit B 10 10
  4. Out of curiosity, how mature/fully fully functional is it, compared to the non-baremetal version? Is there usable documentation in English? I haven't used it.
  5. Steven, RaSCSI is great if you know what you're doing, or are comfortable experimenting, but it isn't instant-on (you have to wait for the Pi to boot, if you don't leave it powered on), and it's not a product you can buy "ready to go". I wouldn't characterize it as "for a beginner", but it really depends on your level of comfort. There are a _LOT_ more moving parts than with something like SCSI2SD, which is "instant on" even moreso than a traditional HDD (no mechanics to spin up).
  6. Tom, It's also worth pointing out that you can just slap an ISO on an SD card using DD, BalenaEtcher, or whatever, and install from it, to a separate volume on the same SCSI2SD. The SCSI2SD can be both your CD-ROM and HDD. See attached screenshots on how to configure.
  7. Understood. We've all been there. It's a really easy thing to overlook, especially when you're toggling things on and off on multiple devices, particularly if late at night and/or sleep deprivation is a factor
  8. You can't do this. Double termination on a SCSI bus will cause havoc. ONLY the _end_ of a SCSI chain must be terminated. Nothing else. It might work some of the time, flakily, but it's just not allowed by the SCSI specification.
  9. Out of curiosity, roughly how long did it take to install 7.5.3 this way?
  10. Nope, you do it from scsi2sd-util, with your SCSI2SD connected to a modern PC, via USB. You can download the latest version of SCSI2SD-util here http://scsi2sd.com/v5/files/v4.8.4/
  11. ...but on the same SCSI2SD project landing page, if you bother to scroll down, you'll see links to the code repos for both V5 and V6, which, by your own admission, contain clear licensing terms. Also, a simple web search for "SCSI2SD GPL" shows evident source code. While I don't disagree with you that the codesrc website could certainly be more clear, I also don't find the argument that the licensing of the source is at all "opaque". The links to the SCSI2SD git repositories have been on that page since at least 2014 in the case of V5. Here's a a snapshot of the site from April 4th, of 2018, f
  12. Very informative presentation. It's unfortunate that you state that SCSI2SD is "not open source, but used to be" which is an inaccurate representation of the actual situation, where SCSI2SD V4/V5 _and_ V6 firmware is fully open source, and GPL licensed, as is the GUI code to configure the utility. It has _always_ been this way. The only thing that's not open source with SCSI2SD V5 and V6 is the actual PCB layout. The SCSI2SD V4 gerbers are still open source, and always have been. You are correct in one regard, however, which is that the SCSI2SD V6 PCB has never been open source. SC
  13. I'm looking for a list of capacitors/sizes/values for the Delta SMP-220DB PSU,as used in the PowerMac 8100/80 and Quadra 800/840AV. If anyone has created one, if you'd be so kind as to share it, that would be greatly appreciated. My 26-year-old PowerMac 8100/80 thanks you in advance
  14. Attached is a seven-page excerpt from the Apple Developer note PDF, which is 94 pages, and contains the authoritative info I was looking for. Apple 5500-6500 CommSlot II specs.pdf
  15. Does anyone here have or know of any reference documentation from Apple for CommSlot II specs, and pinouts? and CommSlot I? I found the original CommSlot I pinout documented on Apple's website, as TA31498
  16. Agreed, way off topic, but I think it'd be very interesting to perhaps see if you could add modern wireless connectivity to CSII machines by way of an RPi Zero W, or other low cost SBC with wi-fi. It would need to use the serial interface, hopefully at a reasonably high speed, since most low end, modern SBCs don't have any sort of PCI support. Does anyone here have or know of any reference documentation from Apple for CommSlot II specs?
  17. This isn't an accurate depiction of the current state of things, these days, in all circumstances. Most consumer SD cards do have some form of simplistic wear leveling, although the specifics are considered industry secrets. Many SD cards now exist for custom write-heavy uses, which may have a larger array of pre-reserved blocks for re-allocation later in life, if cells/blocks go bad. And then there are the rather expensive Single Level Cell SD cards, which Panasonic and Delkin Devices, as well as a number of others make. They're costly for a reason.
  18. It's actually still a true statement, even if it's not for you. The numbers don't lie. The good news for you, though, is that we envisioned this use case (V5.5+IDC50) long ago, and have a couple of very straightforward solutions to it, along the lines of what you're referring to:
  19. Apparently they meant MacSD, which shares no firmware or hardware design with SCSI2SD at all. I have one, and they're nice, but I ran in to some of the same issues as @cheesestraws did, and while it has a nice feature set, it's not the most affordable solution. Since someone brought it up earlier in this thread, SCSI2SD V5.2 has been released, replacing V5.1, which we've been sold out of for over a month. Further details in the linked thread above.
  20. These are now available for purchase at https://store.inertialcomputing.com/ProductDetails.asp?ProductCode=SCSI2SD-V5.5-2.5-inch
  21. This sounds like it could be a double-termination issue. Does the external enclosure have its own termination? Try disabling termination on whatever device is mounted externally, and see if it makes any difference in behavior on boot.
  22. For the record, that warning only exists because people have been known to mis-wire the 12 volt line to 5VDC when making their own cables, and _that_ will fry a SCSI2SD. However, simply providing 12 volts from a normal four-pin cable is perfectly safe. The 12 volt line simply isn't routed anywhere on any version of SCSI2SD.
  23. That's definitely not accurate, I've been using one in my 630CD for literal years. Large CF cards, or cards that don't speak "true IDE" will likely fail, though.
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