> -----Original Message-----
> From: 'joant_at_cadence.com' [mailto:joant_at_Cadence.COM]
> Sent: Friday, July 31, 1998 2:11 PM
> To: Dellett, Anthony
> Subject: Re: PDP boot problems
>
>
> Thus spake Allison:
> > I have both S100 systems and PDP-11s so I can be a translator and
> > relationship mediator...;)
>
> Thanks, Allison :)
>
> > MXV21??? do you mean RXV21?
>
> Yes, I do. My mistake. Tony called CRDS and confirmed that it's
> supposed to be a drop-in replacement.
>
> > Also in PDP-11s interrupts are "shared", actually daisy chained via
> > request grant on the backplane. if the cards are not in sequencial
> > slots in the grant chain then things don't work.
>
> Will confirm this. What happens if the cards are placed as:
>
> M8186 MXV11
> RXV21
>
> I'm guessing this won't work, but it was one of the alternate
> orderings
> I had been using. I can't remember well enough as to how the
> backplane
> was wired...though I do remember that if you're going to skip
> slots, you
> need to use teeny bus grant continuity cards :) (That's for
> a later date.)
>
> > the tests work if... all them jumpers on the MXV11s are correct.
>
> Shoot. I was afraid of this. I'm going to have to rip all of the
> jumpers out that are non-standard and start over again.
>
> > ODT runs without interrutps so it can only mean that the
> > console addresses
> > are real but the interrupts may be wrong.
>
> Verification of the interrupt jumpers showed them to be at the
> correct addresses when I checked this morning, but I'll double-check
> tonight (under a BRIGHT lamp with my VOM) and verify them.
>
> > Thost can contain one of four groups of software, DEC rom ODT
> > and boots,
> > Customer programs, DIAGnostics or CRD ODT/boot code.
>
> Right. I'm pretty sure that ONE of these cards as the correct loader
> for the FC202, but I've lost track as to which is which. I'll pull
> the PROMs for the time being, and will eventually read them in on
> my PROM programmer to figure out what the hell they do.
>
> > The bus config is unlikely a problem, the MXV11 addessing for
> > ram can be.
>
> Again, the config was set to Ram bank 0 last I checked on
> this particular
> card, but I can't be 100% sure. I'll check first thing when
> I get home...
>
> Thanks for your help, Allison! I now know where to focus my efforts.
>
> -Joan
> --
> - Joan Sarah Touzet | So grey is not the color I
> expected -
> - joant_at_cadence.com | On someone who's so often
> touched by grace -
> - joyce.eng.yale.edu/~joant| But always she's the spectre of
> uncertainty -
> - I still love OS/2. | I first endured, then faded,
> then embraced... -
>
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Received on Fri Jul 31 1998 - 15:19:04 BST