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On Tue, Sep 18, 2012 at 2:30 PM, Dale <rdalek1967@×××××.com> wrote: |
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> Volker Armin Hemmann wrote: |
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>> Am Dienstag, 18. September 2012, 04:50:30 schrieb Dale: |
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>> |
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>>> One would think that modern stuff would have some sort of protection. |
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>>> Odd. |
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>>> |
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>> indeed. The modern stuff with protection is called 'usb'. |
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>> |
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>> |
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> |
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> Well, I meant for the serial/parallel chips tho. Surely it can't be |
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> hard to at least keep them from blowing their fuse. |
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If it's TTL, no problem. If it's CMOS, it requires extra work (and |
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cost) in an environment where every penny off of a component is |
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important. Point is, RS-232 and IEEE-1284 weren't designed for |
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hotplug, and plug/unplug events are very, very rare. Manufacturers are |
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under no obligation to extend support beyond spec, and it doesn't make |
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sense for them to, given that USB is available where it's necessary. |
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USB, on the other hand, was explicitly designed to handle hotplug. It |
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even shows in comparison to the connectors it replaces; DB-25, DB-9 |
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and Centronix connectors typiclaly have explicit mechanisms to retain |
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devices and prevent them from accidentally unplugging. DB-25 and DB-9 |
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connectors didn't originally even come with thumbscrews; I've still |
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got some cables laying around that require the use of a small |
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screwdriver. No such manual step with USB, as it's an expected event. |
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-- |
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:wq |
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