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.\" @(#)tu.4 6.2 (Berkeley) 3/27/91
console cassette interface
interface provides access to the
The interface supports only block
The devices are normally manipulated with the
program using the ``f'' and ``m'' options.
The device driver is automatically included when a
system is configured to run on an 11/730 or 11/750.
on an 11/750 uses the Radial Serial Protocol
to communicate with the cpu over a serial line. This
protocol is inherently unreliable as it has no flow
control measures built in. On an 11/730 the Modified
Radial Serial Protocol is used. This protocol incorporates
flow control measures which insure reliable data transfer
between the cpu and the device. Certain 11/750's have
To reliably use the console
prom is required. For those 11/750's without
prom, an unreliable but often
useable interface has been developed.
This interface uses an assembly language ``pseudo-dma'' routine
to minimize the receiver interrupt service latency.
the system, the configuration must
system will run on an 11/730 or use an
This unfortunately makes it impossible to configure a
single system which will properly handle
and an 11/730 (unless both machines have
.Bl -tag -width /dev/tu0xx -compact
.It tu%d: no bp, active %d.
A transmission complete interrupt was received with no outstanding
request. This indicates a hardware problem.
.It "tu%d protocol error, state=%s, op=%x, cnt=%d, block=%d."
The driver entered an illegal state. The information printed
indicates the illegal state, operation currently being executed,
count, and the block number on the cassette.
.It "tu%d receive state error, state=%s, byte=%x."
The driver entered an illegal state in the receiver finite
state machine. The state is shown along with the control
byte of the received packet.
A timer watching the controller detected no interrupt for
an extended period while an operation was outstanding.
This usually indicates that one or more receiver interrupts
were lost and the transfer is restarted (11/750 only).
.It tu%d: hard error bn%d, pk_mod %o.
The device returned a status code indicating a hard error. The
actual error code is shown in octal. No retries are attempted
console interface without
while the system is multi-user; it should be used only with
the system running single-user and, even then, with caution.
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