LSI 11/2 question - test-drb@ccmp.vtda.org

17 Aug 2006

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Subject: Re: LSI 11/2 question
   From: "Ethan Dicks" <ethan.dicks at gmail.com>
   Date: Thu, 17 Aug 2006 17:15:25 +1200
     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>

On 8/17/06, Scott Quinn <compoobah at valleyimplants.com> wrote:

  I have the opporitunity of getting some LSI 11/2 boards (LSI 11/2 processor, some
memory, serial MUX, RK floppy driver) (I think) 
If it's a floppy card, it's probably an RXV11.  If you had an "RK"
controller, it would most likely be the RKV11D which typically comes
in its own box with cables to the Qbus enclosure with the CPU. 
RK card is likely only the interface to an external box with the full 
RK controller.

...
 The RXV11 will only work with the RX01 floppy drive or
an RX02 with
the internal dip switches set to act like an RX01. 
Could also be RXV21, that works with RX02.

...

  Couple questions: will the multiport serial work
for a console or do I need a specific "console" card? 
A DLV11-J (the common 4-port card) has one port strapped for console use. 
Any DL compatable card set to the console address and vector (176500/60)

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  Will these boards work in a VAX 4k BA430
chassis/backplane, or will the C/D wiring and DSSI over C/D throw them off? 
Hmm... don't know that off the top of my head, but I would think that
if anything in the chassis is loading the C/D slots, you might have a
problem with the memory refresh lines. 
Unknown.  The 11/2 does not do refresh and is only dual width.

...
 I have never used 18-bit Qbus equipment in a backplane
that modern, so
I can't comment from experience. 
11/2 is not 18 bit, it is the dual width varient of the 11/03 the and 
is a 16bit address microPDP-11.

Allison