FW: PDP boot problems - test-drb@ccmp.vtda.org

31 Jul 1998

...
  -----Original Message-----
 From: &#39;joant(a)cadence.com&#39; [mailto:joant@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(a)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... -