On Wed, Oct 18, 2023 at 7:32 AM Paul Koning via cctalk
<cctalk@classiccmp.org> wrote:
>
> If you have an MSCP translator type controller, but the translation is poorly 
> done, you might end up with it failing for some operating systems.  That's 
> not too unlikely given that the MSCP spec was for a long time a DEC 
> confidential document, so third parties had to reverse engineer things (and 
> dodge DEC lawyers).
>
>         paul

I have at least one third-party vendor QBUS MSCP SCSI controller which
has a sticker on the PCB which says "Licensed under U.S. Letters
Patent 4,449,182"

Which is of course the DEC MSCP patent:
http://www.bitsavers.org/pdf/dec/dsa/mscp/MSCP_Patent_4449182.pdf

So I guess at least in that case the vendor did play along with DEC lawyers.

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