Messages in this thread | | | Date | 04 Jan 2002 17:30:00 +0200 | From | (Kai Henningsen) | Subject | Re: ISA slot detection on PCI systems? |
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root@chaos.analogic.com (Richard B. Johnson) wrote on 03.01.02 in <Pine.LNX.3.95.1020103100747.4554A-100000@chaos.analogic.com>:
> ISA has nothing. Just fixed port addressing where an attempt > is made to find out something about the hardware by writing > and reading the results. If you think you have device 'A' > at port N, but you don't, and you write something to condition > device 'A' for a response, you could, in fact, tell another > device to hit the reset switch or, worse, format your disk(s).
Best-known example is probably trying to autodetect anything but a NE2000 card before detecting the NE2000 card that's in the machine.
I've even seen BIOSes freeze in that situation. And yes, I do mean whole- machine-freeze. An NE2000 *really* doesn't like being touched the wrong way.
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