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Hardware problems (Score:2)
Years ago, some friends of mine had a couple of PDP-11s (mostly PDP-11/34's but there was enough to run a PDP-11/44 or two from various parts). The main RK07 disk controller worked fine, but it would flake out every few weeks.
How to fix it? Replace the mostly-working RK07 controller with the RK07 Voodoo Controller(tm). Boot once, and watch the Voodoo Controller fail. Replace the Voodoo controller with the mostly-working controller and reboot. Then stand back and watch the RK07 work for a few weeks or months without any errors whatsoever.
No one really understood what was going on here, just that the process Just Worked(tm). Since these zombie machines were resurrected from the dump heap, DEC engineers, replacement parts and service contracts weren't an issue -- they effectively didn't exist. :-)
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