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I'm not sure how many mfg still list them on their available list in the old standard 0.1" pin spacing.Įl Reg ran a story that Chorus (formerly British Steel) ran them for controlling all sorts of bits of their rolling mills but I can't recall if they are The PDP 11 (like the PARC Alto) had a main processor built from standard 4 bit TTL "ALU" parts and their companion "register file." So 2nd, 3rd,4th sourced. There are as many (or more) failures from poorly made joints or crudded up connector pins as there are down to actual genuine faulty components (although I have seen a 1972-vintage audio IC which succumbed to the Purple Plague - once in my entire career of servicing thousands of the bloody things.) Vintage electronics is a field all to itself.
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Cost saving/"better design" means that's no longer done, plus they're run a lot closer to their voltage rating (Generally one would use 25V parts on a nominal 12V line to ensure switching spikes didn't take 'em out.) and I believe _that_ is a major contributor to modern failure rates. In the old days ESR on electrolytics was so high that you'd always slug 'em with a small ceramic nearby. There's a hell of a lot to be said for keeping spares in sealed baggies, or even better in sealed baggies with an inert atmosphere. My experience of transformers smoking is "only if left switched off for long periods - it's usually water which does 'em in and one in use is invariably warm enough to stay dry. WRT "resistors drift" - that hasn't been an issue since carbon stopped being used - unless you smoke 'em of course. From which I deduced that if any of them would ever reach their Y2K-rollover, the worst that would happen was that they wouldn't be routing for a few minutes until they had finished rebooting, just as with any other interruption, the chance of which occurring would be way greater. After a brief check I reported that the longest-running router had still 42 months to go before *it* would hit that particular date which was roughly half a year away on our calender, and that one which had just been rebooted happily lived in late 1993 with no ill effects. In the run-up to Y2K, I was told several routers had to be replaced because their firmware was not Y2K-compliant and they couldn't be upgraded to handle the then-current firmware version that was. "There's an item coming down the assembly line, it needs to be sprayed/welded/have a barcode stuck on/whatever", is not a task that requires the robot to know whether it's 1, or 1.
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Real-time systems don't necessarily need to be aware of the current wall-clock time. When the 32-bit clock counter rolls over and we find ourselves back in the 1970's.ĭepends.