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ISA: Difference between revisions
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CSNs start from zero but 0 is cards with no id
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AMD recommends (PCnet-ISA II 3) disabling interrupts while performing the IO operation to prevent anything else from interfering (as shown above). No other ports should be accessed. It is also recommended to '''send it twice''' in case the key is not received the first time.
Before doing anything with ISA cards, the number of CSNs should be obtained using the PnP BIOS. CSNs are always sequential and start from zero (zero represents unidentified cards).
[[Category:Buses]]
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