TU(4)

NAME
tu - VAX-11/750 TU58 console cassette interface

DESCRIPTION
The tu interface provides access to the VAX 11/750 TU58 console cassette drive.

The interface supports only block I/O to the TU58 cassettes. The devices are normally manipulated with the dd(1) program.

The device driver is automatically included when a system is configured to run on an 11/750.

The TU58 on an 11/750 uses the Radial Serial Protocol (RSP) to communicate with the cpu over a serial line. This protocol is inherently unreliable as it has no flow control measures built in.

FILES
/dev/tu0

DIAGNOSTICS

tu%d: lost recv interrupt.
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.

HISTORY
The tu driver appeared in 4.1BSD.
A new driver showed up in NetBSD 1.1A.

BUGS
The VAX-11/750 console interface is unuseable while the system is multi-user; it should be used only with the system running single-user and, even then, with caution.