On Jul 2, 2007, at 12:16 AM, Kim Hawtin wrote:
>> We'll need to know that so we
>> can figure out what type of DEC controller it emulates, which in turn
>> will determine how we'll try to boot the machine.
>
> is this why they are called "Emulex" ?

   I have no doubt that this is where their company name came from,  
but I've not asked the people who came up with it so I'm not 100% sure.

>>> also has a tk50, four port serial card, deqna (sp?) ethernet
>>> and a grant continuity card... (not sure how that works yet)
>>
>>   A grant continuity card is required for unused slots, to  
>> maintain the
>> continuity of the bus grant lines.
>
> it just passes through various signals?

   Yes.

>>   Be careful here.  The ordering of the cards in Qbus is (in many  
>> cases)
>> important, and with the BA23 in particular, the bus is straight- 
>> through
>> A-B-C-D for the first three slots (for CPU & memory),
>
> C & D are for CPU and memory info only?

   No...The "C-D interconnect" is used by a few different things.   
One example is the RLV11 disk controller.  It consists of two quad- 
width boards which talk to each other via the C-D interconnect.  The  
MicroVAX-II (and -III, and others) use "PMI" (Private Memory  
Interconnect) to access memory.  That' the ribbon cable that's daisy- 
chained from the top of the CPU to the top(s) of the memory board 
(s).  I don't recall offhand if any other memory-related signals are  
passed along the C-D interconnect in the MicroVAX-II.

            -Dave

-- 
Dave McGuire
Port Charlotte, FL