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There are clock problems with version 1 backplanes which requires a patch to the card or reduced operation speed.

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512 on FPC3 due to the use of synchronous fifos.

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These interrupts are not enabled so do not appear in the request register

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see the ``Fairisle/Yes/Maybe protocol'' description for more details.

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Using the original backplane 18MBytes/sec is the maximum reliable fabric rate

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3.55us at 18MHz

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There is one 30MHz and four 28MHz parts.

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A noteworthy exception is the swap operation which always reads from the memory even if present in the cache

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This may be reduced