sh(4) — VAX
Name
sh − Small VAX DHT32 serial line interface
Syntax
device sh0 at uba0 csr 0x38000000 flags 0xff vector shrint shxint
Description
A DHT32 provides eight asynchronous communication lines with no modem control.
Each line attached to the DHT32 communications multiplexer behaves as described in tty(.). Input and output for each line can be set independently to run at any of 16 speeds. See tty() for the coding.
Because no modem control is provided, a flags field of 0xff must be specified to ensure that all lines will be handled as data leads only.
Diagnostics
sh%d: DIAG. FAILURE
A failure has been detected by internal module diagnostics.
sh%d: recv. fifo overflow
The character input fifo overflowed before it could be serviced. This can happen if a hard error occurs when the CPU is running with elevated priority. Interrupts are disabled, and the system then prints a message on the console.
Files
/dev/tty??