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When I worked for IBM, San Jose, in 1969, I wrote a new memory diagnostic for the 1130 / 1800. Wonder if it was mine or the earlier version? My version had a memory stress test that ran in 4K while beating the other 4K, then relocated itself to the other 4K and reversed the process. If the memory was greater than 8K, it would move itself to the next 8K. I remember that it found a flaw in the 1800 design. If a memory position had a parity error after a write, but wasn't read before setting the memory protect bit on the position(s), setting memory protect would mask the error. Great for a process control computer, huh? I reported it because it was an obvious hardware problem and the diagnostic could find it. Management said it couldn't be fixed, but they weren't going to tell customers.
Dean
I used the 1620 and 1401 before the 1130. But the 1130 was the first I used where you could get a timesharing system from DNA.
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