ty@reef.cis.ufl.edu (Tyng-Jing Yang) (02/08/91)
I know when RAM memory goes wrong we can switch to "Monitor mode" to see which bank(socket) is died after reboot. I has one RAM died at bank0, I switch bank0 with bank8 to keep machine up to post this message. But I want to know is there any way to judge the rest RAMs are OK ? How can I check it by electrical instrument ? Thanks for your pointer Jing
bb@reef.cis.ufl.edu (Brian Bartholomew) (02/08/91)
In article <TY.91Feb8004754@reef.cis.ufl.edu> ty@reef.cis.ufl.edu (Tyng-Jing Yang) writes: > But I want to know is there any way to judge the rest RAMs are OK ? > How can I check it by electrical instrument ? Uhh, you aren't going to like this, but pretty much you can't. RAM behavior is a complicated thing - unless the top is blown off, you pretty much need to test it in-circuit under dynamic conditions to tell anything useful. What you need is a program that you run as root, that reads each and every byte of memory in the system. There might be one somewhere in one of the monitors, I don't know. A better test is to write a series of fancy test patterns to the RAM that have been designed to catch the majority of most common hardware failures. However, this would have the undesirable effect of nuking UNIX and all your programs. I expect that there is such a program on the magical diagnostic kernal that is only released to authorized service centers. See if you can talk it out of BusinessLand. You may have to go to Jacksonville (yes, this reference is only useful for North Floridians) to find a BusinessLand. -- "Any sufficiently advanced technology is indistinguishable from a rigged demo." ------------------------------------------------------------------------------- Brian Bartholomew UUCP: ...gatech!uflorida!mathlab.math.ufl.edu!bb University of Florida Internet: bb@math.ufl.edu