RaSCSI Development Thread

[CRP]

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!

 

[CRP]

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[CRP]

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[CRP]

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[K55]

Hello!

Din would be the outer version yes. The "right" version has a right angle 50 pin scsi for internal use. That's why it has the power connector so you don't have to run a usb cable inside your case if you don't want to, say for a standalone setup.

The db25 pinout should be the same, but I dont know if it would be flush, I couldn't think of a easy way to make it work so I left it as a female jack. The crossed out pin is the silkscreen telling you where the ground pin for the network is. The network will have a dot or a cross to indicate the ground, so you need 9 resistor networks (they have 10 pins ). Fuse I left it pretty big to allow you to use anything. I have a parts list @ https://github.com/fran-cap/RASCSI-68kmlaver/blob/master/part information/rascsi_bom.xlsx that might help but any through hole 1A axial fuse should work. The software should work as long as it matches your raspi kernel version.

Hope this helps.

 

[CRP]

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!

 

[K55]

Yes that's fine. Give it a shot.

 

[xrr]

Yes that's fine. Give it a shot.

Hi all,

Hi there any news about this project ?
Anyone knows if it is possible to directly buy a finished RASCSI ?

 

[aperezbios]

Hi all,

Anyone knows if it is possible to directly buy a finished RASCSI ?

If that is your goal, why not consider buying a SCSI2SD V5? http://scsi2sd.com/v5/buy

 

[xrr]

If that is your goal, why not consider buying a SCSI2SD V5? http://scsi2sd.com/v5/buy

Thanks for the link, interesting stuff, but I intend to use it as a high speed communication channel to the pi and not as a storage device.

 

[aperezbios]

Define "high speed"? SCSI2SD firmware (both for V5 and V6) is totally open source; What is your intended use case?

 

[xrr]

Define "high speed"? SCSI2SD firmware (both for V5 and V6) is totally open source; What is your intended use case?

 high speed in retro-computing way... 500kB/s would be just great... 
Intended use case is communication between an Apple //e & a raspberry.
It's open source but if I can solder big electronics, I have never done surface soldering (or whatever its named) and I had the feeling most of explanations where in japanese, so if you have an english pointer that would be great...

 

[xrr]

It seems to be impossible to order this outside of japan at the moment.
So I'm trying to evaluate other options...

How hard would it be no update the design to avoid using surface mount components ?

 

[CRP]

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.

 

[xrr]

I don't do a lot of electronics and I never tryed SMD...  But if I have to buy microscope and specialised hardware for a single project it might not be worth it  After what you're telling me I might reconsider and check out what SMD really involves as it might be easier than what I think ...  thanks
 

 

[CRP]

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.

 

[K55]

Nah the packages here are pretty big. Tack down each corner and drag solder them and its really easy. Shouldn't even need a hot air gun really.

I'm not going to expect the at home user to be able to hand solder 0805 resistors

Generally I like to try and keep costs down when I do a board and when the smd component is 1/3 the price of the thd when you order overseas it makes a big difference.

 

[Ray Bellis]

I just came across RaSCSI, but there doesn't seem to be much developer info on it.

I'm not actually a 68k Mac user, but I've got a couple of E-Mu samplers that are 68k based, and RaSCSI looks like it might be of use.   I already use a scsi2sd but what I'd really like to get working is something like SCSI to RaSCSI -> iSCSI on my Synology NAS.   Has anyone heard of any attempts to make RaSCSI talk iSCSI over IP ?

 

[CRP]

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?

 

[360alaska]

Here: