gslick
Veteran Member
Does anyone know much about one of these Mentec M1 PDP-11 CPUs, or ever used one?
http://www.ebay.com/itm/141048412486
I'm curious about the seller's description that it doesn't have FPU support. That seems like a major issue for full compatibility with all PDP-11 OS.
For example, I have one of these QED-993 CPUs which also lacks FPU support and I was never able to get 2.11BSD to run on it since 2.11BSD assumes that a J11 processor has FPU support.
http://www.ebay.com/itm/200600166676
An old copy of the Mentec page on the M11 says that it supports the FPU with microcode revisions 2.0 or later. I wonder if that is also the case with the follow on M1 ASIC re-implementation of the M11 and if some versions of the M1 microcode do not include FPU support and some versions do.
http://web.archive.org/web/20060324070926/http://www.mentec-inc.com/m11specs.htm
http://www.ebay.com/itm/141048412486
I'm curious about the seller's description that it doesn't have FPU support. That seems like a major issue for full compatibility with all PDP-11 OS.
For example, I have one of these QED-993 CPUs which also lacks FPU support and I was never able to get 2.11BSD to run on it since 2.11BSD assumes that a J11 processor has FPU support.
http://www.ebay.com/itm/200600166676
An old copy of the Mentec page on the M11 says that it supports the FPU with microcode revisions 2.0 or later. I wonder if that is also the case with the follow on M1 ASIC re-implementation of the M11 and if some versions of the M1 microcode do not include FPU support and some versions do.
http://web.archive.org/web/20060324070926/http://www.mentec-inc.com/m11specs.htm