Much swearing - was Re: Do-It-Yourself PDP-11 help!

[Tony Duell]

> 
> Sellam asks:
> > But is it a problem if some lines are terminated and some aren't?
> 
> If it's a small enough system to work reliably without termination
> (e.g., a single backplane), it will be fine even with some signals
> terminated.  Technically that will introduce a small timing skew,
> but in the small system it won't be enough to matter.


One other point. You _must_ haev at least one terminating resistor 
(either on the CPU or at the end of the backplane) on every signal. Just 
letting one float high will not work. Remember the drivers are 
open-collector devices 

-tony