The AM-100/L we used at work until about 1988 did not have any memory protection. It was a pain in the rear trying to develop on it while it was being used in production, as you could easily lock up the entire machine and shut everybody down for five minutes while it rebooted. But our current ERP system is still derived from a Windows port of a DOS port of the original system I built in Pascal on that AM.

We've still got the old machine sitting in a dusty storage room. Last time I tried to fire it up, which was probably more than twenty years ago, it wouldn't boot due to bad RAM. I called the company to see if I could get any documentation on it, as ours was long gone, but they told me they had no interest in helping.

If only we had rust back then