Strange i-con Unibus (?) board

Tue Dec 9 01:55:41 CST 2014

Another computer with similar SIP hybrides is the ND-5000 and they are 
found on several places in the CPU, for instance in the
  - MMU, http://sintran.com/sintran/hardware/nd-5000/nd-324701.html
  - ALU http://sintran.com/sintran/hardware/nd-5000/nd-324704.html
  - Micro program instruction controller 
http://sintran.com/sintran/hardware/nd-5000/nd-324709.html
My guess is that they are fast memory modules used in critical 
applications as the register file for the ALU, storage of the microcode 
or microcode cache and translation tables for the MMU in this case.
My 5000 machine is not so easily accessed right now so I can't look at 
the chips mounted on it to find out any product numbers.

Göran

Pontus Pihlgren skrev den 2014-12-08 10:09:
> On Fri, Dec 05, 2014 at 06:03:35PM -0500, Sean Caron wrote:
>> http://www.ebay.com/itm/Vintage-Computer-Memory-Digital-DEC-logo-1216988-board-from-PDP-11-or-VAX-/261685664915
>>
>> I'm really curious what all those SIP hybrids are running down the one side
>> of the board. I see it's got no less than 8 74181 ALUs so I figure this has
>> got to be some kind of processor?
> I looked at a picture of an MXV11 board today and I noticed similar, but
> not identical, SIP hybrids (as you call them):
>
> http://www.cosam.org/images/pdp11-23/mxv11-b.jpg
>
> Perhaps a clue.
>
> /P
>