Re: 11/40 misbehaviour

From: John Holden (johnh_at_psych.usyd.edu.au)
Date: 08/05/04

  • Next message: Eric Smith: "Re: 11/40 misbehaviour" 
    Date: Fri, 06 Aug 2004 07:54:22 +1000

    RHB wrote:

    > But I agree with the previous email you need to shorten the bus,
    > ck P/S's and swap the first two banks of memory cards by changing the
    > jumpers/switchs and see if the sympton changes.
    >

    Moving memory banks is always a good first test, but beware that most
    decently configured systems would interleave the banks, so a straight
    meory address swap might just move the error from even to odd words
    (16 bits)

    > Plus posted on the web somewhere are a few hand toggle in programs that
    > will check memory, etc.
    >
      Have a look at http://www.psych.usyd.edu.au/pdp-11/hints.html,
    especially the trap catcher.

  • Next message: Eric Smith: "Re: 11/40 misbehaviour"

    Relevant Pages

    • Re: Ram Card Design Help
      ... 32k banks actually are pretty bad. ... 16/48 will work OK for MP/M, but if one wants to implement CP/NET ... extensions and need to be completely in common memory. ... For CP/M 3 any scheme works and it doesn't matter. ...
      (comp.os.cpm)
    • Please help with following NUMA-related questions
      ... Difference between memory bank interleaving and node interleaving ... AUTO allows memory access to spread out over banks on the same node or across ...
      (Linux-Kernel)
    • Re: Migration from 4.2 to 5.0
      ... banks, most likely only one can be used to run your image (only one can be ... XIP region span accross discontigious memory!!! ... > NLedDriverInitialize: Create File errorGteCurrentLEDState: ... > NLedDriverInitialize: Create File errorLedOff: DeviceIoControl ...
      (microsoft.public.windowsce.platbuilder)
    • Re: FBDIMM vs DIMM - any compatibility?
      ... measurably faster if all four channels have the same size of memory on ... performance through interleaving. ... branches can have different banks open, ... each channel will slow you down to the tune of about 5 ns per DIMM ...
      (comp.arch)
    • Re: [PATCH] Mantaining turnstile aligned to 128 bytes in i386 CPUs
      ... block copy then to have an inner per-PAGE loop. ... and/or memory systems are remarkably sensitive to bank interleave. ... accidentally starts up with perfect miscoloring for banks. ... the coloring becomes random with respect ...
      (freebsd-arch)