Can I use a M9302 with a PDP 11/35?

[Henk Gooijen]

> Date: Mon, 2 Mar 2009 08:09:19 -0800
> From: silvercreekvalley at yahoo.com
> To: cctalk at classiccmp.org
> Subject: Can I use a M9302 with a PDP 11/35?
>
> Hi,
>
> Before I do it - I thought I should ask :) Can I use a
> M9302 as a UNIBUS terminator in a PDP 11/35 or 11/40.
>
> The manual mentions a M930 which I don't have, but I do
> have the M9302 which looks a bit more involved (has
> some ICs.
>
> The M9302 was from a 11/34 which is a later generation.
>
> Having said that, the 11/35 does work without the
> terminator - although I cant see a terminator on
> the system.
>
> Thanks
>
> Ian.

 
A lightly loaded system may run without the terminator,
especially if no "DMA" device (such as the RL11) is on
the bus. The start of the bus is terminated on the CPU,
the other end is normally done by the M930 (in the /35
or /40).  I have the M930 in 2 variations.  One with
discrete resistors, the other with the resistors in a
modern DIL package.
Needless to say that the machine will run better (read:
less chance of hang-ups) with a terminator.
 
- Henk, PA8PDP