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mattislind

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  1. I agree that 5.2V should not be able to trigger the the crowbar but the clicking sound is very typical for an emergency shutdown in the PSU imho. The source might for example be over current or over voltage. In the Sony PSU both the 12V and 5V outputs together control the emergency shutdown. A quick glance at the schematic give that above 6.2V at the 5V or 15V on the 12 V would trigger the emergency shutdown. A reason for false triggering could be excessive ripple due to bad filtering capacitors. Check ripple on the 12V and 5V before the filter inductors. Put dummy loads on the 5 and
  2. Can it be the crowbar in the PSU which false triggers? This repair guide page 10 mentions the crowbar.
  3. Many thanks for the driver! Now my SE/30 is on the net running System 7.0.1 and Mosaic 1.0.3. /Mattis
  4. I traded a Radius board for a Asante Maccon board for my SE/30 and now I need the drivers. I failed to find them through google. Anyone has them? Downloadable? /Mattis EDIT: Maybe I should have written diagnostics disk. So I could check that the card is found in the machine.
  5. There is apparently a widespread misconception that LocalTalk is what we commonly know as asynchronous serial communication. Well. It is not. LocalTalk is 230400 bps FM0 coded bit synchronous SDLC. It is all described in this book Inside AppleTalk. Check Appendix A for more details. So just put a serial cable and a USB adapter would not get you anywhere unless you also go for the AppleTalk Remote Access suite. There is also AppleTalk over PPP according to RFC1378. The remote end also need suitable software to handle ARA or PPP. I think it would be easier and better performan
  6. Good work Mactjaap! And a very nice matchbox as well! I still have the modern-HW-LocalTalk project sitting back in my mind but it won't happen in the near future unfortunately.
  7. Yes. There seems to be a widespread misconception here that "serial is serial". Of course it is not just serial. There are different connectors, different voltage levels, different link protocols and different line encodings. As stated LocalTalk is SDLC/HDLC. But it is using FM0 line-encoding which is self-clocking so external clocks are not necessary. The clock signal is conveyed embedded in the data signal. To extract the clock requires a clock recovery circuit (or software). I been thinking a bit what can be done. But my time for projects are limited. 1. Bitbanging directly from th
  8. I did a quick write-up of my experience with MacIPPi and how to get it working. It is here.
  9. Maybe not a commodity, sure. On the other hand the amount of people doings this kind of networking experiments are quite limited. I see these devices all time at Ebay. They are not directly selling quickly. Search for Dayna Etherprint for example. Not extremely high prices. I bought mine from this this organization in Switzerland: http://www.revamp-it.ch/index.php/en/shop-en/externe-netzwerkgeraete-en/dayna-mini-etherprint-plus-detail
  10. Have you looked into what you could do with the PRU on the Beaglebone Black / Texas Sitara? A really interesting thing. I haven't played with it myself but a guy made a MFM disk emulator based on the PRU coprocessor. It reads the and writes the 5 mbit/s data stream in realtime. I have tested the disk emulator and it works very nice. Essentailly the PRU is executing at 200 MHz hard realtime. No kernel or caches that would make it non-deterministic. It could sample the signal and do full HDLC decoding / encoding as well as CSMA/CA handling, implementing the full link layer. Unfortunatel
  11. BTW here is the a pdf of the book "Inside AppleTalk" that probably cover all of what you need to know on AppleTalk and LocalTalk. Way back as a student I bought this book for hard earned money. I had an idea of a project (much like the macippi but using a PC) but it never materialized. I do remember that the Z8530 is a quite annoying chip to program. I still have the book somewhere though. /Mattis
  12. I am not 100% sure what mactjaap want to do but I would assume it is to get rid of at least the LocalTalk to EtherTalk bridge and maybe the LocalTalk adapter, but still connect to the OrangePi over AppleTalk. Not using PPP over async serial IO. I understand that since one of the beauties of the old Mac is how simple you network them. Plug in the LocalTalk cable and it just works. File sharing, Printers etc. Way before Windows for workgroups. The point is that RS-232C is really only an electrical interface which specify voltage levels and connector usage. It doesn't say anything about the
  13. Well. It took me a while to get a grip of how Apple stores files and how to get them on to the machine. I am used to Linux and MacOS X and have never heard of AppleDouble. So it took some time to come up with a solution to first use stuffit expand to repack files into Macbin and then have them unbin:ed on the orangepi netatalk AppleShare directory. Then I simply didn't understand that MacTCP was a setting and not an application. It took some time until I dragged in to the System folder and then it worked. But setting up IP address with MacTCP requires some patience. But in the
  14. Hello mactjaap and everyone else! I can now confirm that the new image is much better. It boots fine. It includes the magcipgw and netatalk daemons. This far I have only tested that I can reach the orangepione AFS server over my localtalk which is connected to a Dayna Etherprint Mini. It mounts the share on the orangepi perfectly. Haven't got around to test the macipgw part yet. I need to put MacTCP on the orangepi so that I can copy it to my Mac Plus. Will report the back the progress later on. One caveat though. The image is 7.97 Gigabyte uncompressed. The SD card that comes with
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