This bug is only visible on some disks, and I have verified that it works
correctly on VAX. However, du to the author, it is a problem on other
machines/disks as well. Here's the author's comments:
> The MI code for the NCR5380 has a small bug in it The RZ56 wants to
> negotiate for Synchronous Data Transfers and when it does, the current code
> looks like it will send a REJECT message as the spec calls for when we cant
> handle the request. However, a couple of lines of code in the
> ncr5380_msg_in routine are missing wrt the PARITY message and anything that
> wants to send a REJECT message. The ATN setup that is done in
> ncr_sched_msgout is immediately negated by the final byte ACK sequence in
> this routine. This causes bad things to happen to an RZ56.
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