Doesn't look home-brew to me... my guess would be that they used the same back panel for both the SCSI version (as pictured) and the Smart Port version for the IIc. The IIc version would have a DB19 connector instead of the SCSI ports (and, obviously, different internal circuitry).

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Possibly. But you'll note this thoroughly documented QC10 webpage lists the model as QC10 Rev. A as well. One would think that they would have changed the model number, as it could otherwise be a little confusing. Then again, maybe not, APple certainly did it into the 90s. However, I did a Google search and QC10 and SCSI did not turn up any references, not that that means anything either given the age and relative obscurity.WIther way, I'm inclined to believe there would not be any dual circuitry in there.