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30 .\" from: @(#)tu.4 8.1 (Berkeley) 6/5/93
40 console cassette interface
44 interface provides access to the
47 console cassette drive.
49 The interface supports only block
54 The devices are normally manipulated with the
58 The device driver is automatically included when a
59 system is configured to run on an 11/750.
63 on an 11/750 uses the Radial Serial Protocol
65 to communicate with the cpu over a serial line.
66 This protocol is inherently unreliable as it has no flow
67 control measures built in.
69 .Bl -tag -width /dev/tu0xx -compact
74 .It tu%d: lost recv interrupt.
75 A timer watching the controller detected no interrupt for
76 an extended period while an operation was outstanding.
77 This usually indicates that one or more receiver interrupts
78 were lost and the transfer is restarted.
86 A new driver showed up in
91 console interface is unusable
92 while the system is multi-user, because interrupts
93 occur at a very high priority level (spl7) and cannot be blocked with splbio.
94 Use this driver only when the system is running single-user and,
95 even then, with caution.