PDP-11 Controller needed to use a couple of RX33 drive

[Johnny Billquist]

SPC <spedraja at ono.com> wrote:

> Mmm... this needs of one BA23, isn't so ?

Not neccesarily. The BA23 backplane is also a distribution board for the 
RQDX controllers.
But for the RQDX3 you also have a separate board, called RQDXE (if I 
remember right) which do the same thing, and makes it possible to use 
the RQDX3 without a BA23. If you have a BA123 you always need the RQDXE, 
and if you wanted to use more than one hard drive on the RQDX3 you also 
need the RQDXE, since the BA23 distribution board is buggy, and can't 
actually connect two hard drives, even though you have two connections.
I think it's worth pointing out that people should never even try 
connecting two hard drives in a BA23. You'll definitely wreck whatever 
contents you have on the disks if you try.

Another option to use a RX33 would be to get a RQZX1, but that is 
probably harder to fine, and more expensive.

	Johnny

> 
> Regards
> Sergio
> 
> 2009/6/13 Patrick Finnegan <pat at computer-refuge.org>
> 
>> > On Saturday 13 June 2009, SPC wrote:
>>> > > I am searching one controller to use a couple of RX33 in one
>>> > > PDP11-23/PLUS. Someone knows what could I use ?
>> >
>> > RQDX3
>> >
>> > Pat
>> > --
>> > Purdue University Research Computing ---  http://www.rcac.purdue.edu/
>> > The Computer Refuge                  ---  http://computer-refuge.org
>> >
> 


-- 
Johnny Billquist                  || "I'm on a bus
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