How do you test RAM to see if it's bad?

I've picked up some dedicated DRAM testers over the years...

Combined, they can test 4516, 4164, 41256, 411000, and 44256.

Next, I have testbed systems that I can use to test 4k x 1 and 16k x 1 tri-votage DRAMs, 4416, and 4464 DRAMs.

And to round it out, my EPROM programmer will test various SRAMs and DRAMs as well.

I've also built a ZIP to DIP adapter to test 4464 ZIPs.
 
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