PDP 11/34 rebuild

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sun May 25 16:11:14 2003

> FAQ. This is the result of having a 9302 terminator, whichg asserts
> SACK, and a missing NPR jumper somewhere. Either you have a card

[...]

> response to one of your posts recently, and Tony (on more than one
> occasion) explained in detail why this has the effect it does.

And I've just given a brief explanation _again_ :-)

> Don't feel *too* bad about it, I got caught myself with that, once.

Me too... And I once had a problem of a machine halting at the power-fail
trap vector (I think) which turned out to be due to a failed DIP switch
on a DL11 which made that device's interrupt vector the smae as the power
fail trap. As soon as RT11 booted and enabled interrupts, the machine halted.

It look a long time to find that one. Of course I spent most of that time
with the CPU boards on extenders, trying to sort out the power fail logic...

-tony
Received on Sun May 25 2003 - 16:11:14 BST

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