Hello, I am looking for a sophisticated RAM-Check-algorithm, that does not only detect problems with one cell like a simple write and read back. It should also be able to detect short ciruits and breaks of address-lines and maybe timing problems on the address-bus. Thanks!
Beware of verification by just writing to a location and then immediately reading it back: this sort of test can pass with the RAM chips not fitted! (there can be enough capacitance to hold the pattern long enough for the read to "verify" correctly!)
That's right. Maybe I wasn't clear, but I did say verify after all locations have been written. In other words, write the entire RAM, and then verify the entire RAM.
Greg, Yes, you did! There was another reply in the thread which didn't seem so clear, but my reply seems to have been attached to your post. Sorry. Maybe this board just gets a little confused in its threading with different timezones (I'm on GMT in the UK). Rgds, Andy.