18 Oct
2023
18 Oct
'23
11:38 p.m.
On Wed, Oct 18, 2023 at 7:32 AM Paul Koning via cctalk
<cctalk(a)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.