[rescue] [FWIW] RaSCSI

[Doug McIntyre]

On Mon, Feb 21, 2022 at 09:39:03AM -0600, Lionel Peterson wrote:
> So I found the RASCSI on Tindie:
> 
> https://www.tindie.com/products/landogriffin/rascsi-full-size-assembled/
> 
> And the BlueSCSI:
> 
> https://www.tindie.com/products/theoldnet/bluescsi-to-sd-v10-c/
> 
> And I'm trying to figure out what it would take to use such a device in an
> Ultra 60. Ideally I'd like to keep any hard drive emulator hardware inside the
> case, but I guess an external drive hanging off the SCSI connector on back of
> the system would be OK since the internal SCSI devices are on trays, except
> the CD drive, which is a 50 pin cable.

Yeah, neither of those devices are designed to plugin to the UWD SCSI
backplane that the U60 uses. (in order to do so they would probably
have to redo the design, and double the latch buffer, etc).

But you mention the 50-pin CD-ROM SCSI cable, which would be perfect to do so on.

(At least on the RASCSI), it can answer for several different SCSI IDs
and LUNs at the same time with different devices, so you should just
be able to plug it into the 50-pin SCSI CD-ROM cable, and go from
there with a number of virtual devices on the SCSI bus from it.

So, theoritically (since I gave away any of my U60s ages ago), you
could just plug it in there once, and have it emulate all the different devices you wanted. 

Otherwise, you could do it off the back, with a wide to narrow SCSI
adaptor cable setup, but that seems excessive.