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CRP

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  1. CRP

    RaSCSI Development Thread

    I also checked the DB25 SCSI pins and they are correct. So the only consequence is that I can not use a standard 40 pin ribbon cable to connect the rascsi to the raspi, but have to set the pins one by one with a bunch of duponts, right? Or I could cut the "wrong" traces and connect with some wire to get back the standard raspi layout?
  2. CRP

    RaSCSI Development Thread

    Hi, I finally got together all components and am almost ready for assembly. Just for the heck I decided to check the the raspberry pin connectors and I'm not sure I understand them. While D0-D7, DP, CD and ACT are where I expect them to be the rest of the pins are not. Looking at the original japanese schematic, pin 13, corresponding to GPIO 27, should be for SEL, but on your board it is connected to ATN; equally for MSG (@ GPIO22, but should be REQ), SEL (@GPIO19, which should be ATN), IO (@GPIO26, BSY), RST (@GPIO21, should be ACK), ACK (@GPIO20, should be RST), BSY (@GPIO25, should be IO), REQ (@GPIO23, should be MSG). I'm a newbie at this stuff so maybe I am mixing things up, can you please help me understand if these connections are correct?
  3. CRP

    RaSCSI Development Thread

    So I just received the PCBs (I ordered a batch of five). Now I am after the parts: I can get the transceivers at RS, but they do not have the resistor networks. Other suppliers charge enormous s&h fees... Can I replace the resistor networks with just 10 ordinary resistors each?
  4. CRP

    RaSCSI Development Thread

    I did use a cheap USB microscope (about 15USD from China), but a good magnifying glass should do. Basically using a syringe you apply a very thin stripe of solder paste across the contacts, lay the IC on top of it, then heat the whole thing with the gun and usually everything goes into place by itself I was surprised by how much more convenient than trough-hole this really is, especially for soldering passive components.
  5. CRP

    RaSCSI Development Thread

    Actually I must say, after building a different project (TF530 Amiga accelerator card), that SMD is much more pleasant and sometimes easier than thru-hole. You just need a heatgun and solder paste instead of soldering iron and lead. I ordered a few rascsi pcbs from China, and should get them in a few weeks. I will post some updates on what I get, the components I will buy and how the whole thing turns out. And concerning the SCSI2SD, I just prefer to build something myself rather than buying a ready-made device.
  6. CRP

    RaSCSI Development Thread

    Many thanks for the help. I just ordered a couple of din boards on dirtypcb. I shared the pcb, specifying the url of your github page, so everybody can find it there as well. Please let me know if this is ok for you. I believe I can get all parts at RS online, once the board arrives I will post a complete list of the parts I got and add a posting about how things went with the adapter. Thanks!
  7. CRP

    RaSCSI Development Thread

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  8. CRP

    RaSCSI Development Thread

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  9. CRP

    RaSCSI Development Thread

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  10. CRP

    RaSCSI Development Thread

    Hi, I am considering building this adapter. I have a few questions though: 1) I would like to build an adapter to connect to the external DB25 SCSI connector of my SE/30, thus should I build the DIN version 1.6d? 2) what is the power connector in the other version for? 3) can I install a male DB25 connector to the port so that I can plug it directly into the Mac? 4) I'm unsure about the resistor networks, due to the "crossed out" pins. What part do I need exactly, and how many pins are used? 5) what should I use as fuse? any specific part suggestion? 6) I gave a quick look at the software side. From what I understand, it is not necessary to install the kernel module, and one can just launch the binary specifying ID and file. correct? Thanks!
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