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When virtual RAM is present, the driver unfortunately is unable to
establish the physical address of the memory to be transferred (the
virtual drivers do not offer any information about this). A decision
by the driver itself when the data are to be copied via a buffer to
ST-RAM also doesn't seem sensible, as a separate buffer would have to
be created for each process to avoid collision deadlocks. Therefore
programs must themselves ensure that the memory to be transferred lies
in ST-RAM when virtual RAM is present (see also SCSILIB.H). Transfer
for ACSI accesses via the FRB or the XFRB does not present any
problems here.
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