Hi
 In my case, the parity error is ALWAYS the same address. I believe the
problem to be with VME cards instead.
 If i have no VME cards installed, then the machine boots fine. (only 4
megs though)
 If i put in any memory boards into the machine, it fails with the parity
check.
 If i put in the xyc VME board, the kernel fails on boot (bus error)

 I spent a good 2 hours last night going over jumper settings on both
the CPU and the back of the 12 slot cardcage, and nothing seems to be
wrong.

 Anyone out there with a working 3/160 want to email with me their exact
jumper configuration?

 Thanks!

 Chris

On Wed, 9 Sep 1998, Ian Clark wrote:

> On Mon, 7 Sep 1998, Alfred Arnold wrote:
> 
> > >It looks like the parity error is happening just below the 4MB boundary,
> > >which would seem to indicate that it's a problem with memory card #1 (the
> > >one in slot #5). Try removing that card and replacing it with the one
> > >from
> > >slot #3. You'll have to change a jumper on the card to mark it as RAM
> > >CARD
> > >#1 (or #0, depending on how they numbered those...). That will take you
> > >down to 8MB of RAM, but it's probably your only solution if that mem card
> > >is bad.
> > 
> > If it's really a 3/160, the first 4 Mbytes are on the CPU board and I
> > don't know if there is a jumper on the board to disable the on-board
> > RAM...so this might be a reason why the machine was thrown out :-(
> > 
> 
> It is possible to replace the chips, I have a 3/140 which had a similar
> problem (parity faults, lots of them at different addresses). Finding the 
> dud chip was a bit of a problem , and its here I come clean with the 
> nasty thisgs I did to my machine! To find the chip I cut the data-out pin 
> of the 4116? 4164? memory chips in sequence to try to find a pattern as 
> to address range /bit for each chip. I eventually found the right one and 
> replaced it. Probably more by good luck than anything else. 
> 
> In this case I figured the machine was dead anyway and I coudn't make it 
> worse. 
> 
> Of course if someone has details of how to map the parity fault details 
> to a chip, its a piece of cake
> 
> 			Ian (I love the smell of flux in the morning) Clark
>