
Originally Posted by
bobstek
I remember any number (okay, a small number of...) RAM test programs. I think there was one included in NorthStar DOS, but there were several that ran under CP/M - one of the CP/M archive sites should have some. They usually did multiple tests - walking bit left, walking bit right, checkerboard, all 1's, all 0's, etc. After identifying bad addresses, the usual solution was to swap with known good RAM chips to more precisely determine which chip(s) were bad - usually in a binary search fashion - i.e., replace half a bank and run the tests again, etc. Most if not all of my memory boards were socketed, so the task was tedious but do-able.
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