TU(4) | Device Drivers Manual (vax) | TU(4) |
tu
— VAX-11/750
TU-58 console cassette interface
The tu
interface provides access to the
VAX-11/750 TU-58 console cassette drive.
The interface supports only block I/O to the TU-58 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 TU-58 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.
The tu
driver appeared in
4.1BSD.
A new driver showed up in NetBSD 1.2.
The VAX-11/750 console interface is unusable while the system is multi-user, because interrupts occur at a very high priority level (spl7) and cannot be blocked with splbio. Use this driver only when the system is running single-user and, even then, with caution.
June 5, 1993 | NetBSD 10.99 |