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.
