booting rt11 v5.1 on an 11/45

[Tony Duell]

> 
> Tony wrote...
> > Thougths (and be warned that I am not an RT11 expert)
> >
> > Firstly, where does it halt?
> I will get that information the next time I go down and work on that 
> machine.

It does actually halt, right, and not hang with the Unibus in an odd 
state (e.g. due to a lost grant somewhere), I trust. 

> 
> >Does anything ever appear on the
> > console? Is it possible there's a problem with the console interface?
> Possible, but... xxdp (both v1 and v2.5) works, and vtserver (which is of 
> course highly dependant on the serial port) works.

Yes, but do those programs use interrupts? RT11 certainly does.


> 
> > I've seen this sort of problem once on an 11/34. It halted when booting
> > RT11. It turned out that one of the DIP switches on the DL11-W console
> > interface card was defective, the card was therefore sending the wrong
> > interrupt vector. As soon as RT11 enabled interrupts on that device, it
> > got said bogus vector and halted (see above).
> I've tried a few different DL11-W's, all the same. I have this funny feeling 
> it doesn't have a good line clock.

I can't rememebr if RT11 needs the Line Time Clock to boot. I have an 
idea it doesn't, at least not for the simpler monitors. 


> 
> Other oddities - the DL11-W diagnostic locks up right after it says 
> something like "01 devices under test" on two different DL11-W cards. On the 
> third card, it continues but then says something about LTC bit 7 isn't 
> setting. I find it hard to believe all three cards are bad... especially 
> when they work fine transmitting and receiving 10mb without error under 
> vtserver. But then, perhaps vtserver isn't doing interrupt mode.

YOu are using DL11-W cards, right? That is, ones with a built-in line 
time clock. Do you have a line time clock module -- a KW11-L single-height 
board -- in slot C of the very front slot of the processor backplane. If 
you do, you must disable (with the DIP switches) the LTC on the DL11-W 
card. If you don't then there's a wire-wrapped jumper documented 
_somewhere_ in the printset that has to be in place to complete the grant 
chain over the slot where the KW11-L goes.

-tony