10-09-2013
I droped the $! as the example line failed yesterday, but Corona's script did run successfully (but wrote a new line each loop).
Today its vice-versa (still copy-pasted), weird things happen on/to my laptop...
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dhq(4) Kernel Interfaces Manual dhq(4)
Name
dhq - DHQ11 communications interface
Syntax
device dhu0 at uba? csr 0160440 flags 0x?? vector dhurint dhuxint
Description
A DHQ11 provides eight communication lines with modem control.
Each line attached to the DHQ11 communications multiplexer behaves as described in Input and output for each line can be set independently
to run at any of 16 speeds. See for the coding.
Bit i of flags can be specified for a DHQ11 to say that a line is not properly connected and that the line should be treated as hardwired
with carrier always present. Thus, specifying ``flags 0x04'' in the specification of would cause the third line to be treated in this way.
The driver operates under the control of the driver.
Diagnostics
dhu%d %d: DMA ERROR
The indicated channel failed to transfer DMA data within 21.3 microseconds of the bus request being acknowledged or there was a memory par-
ity error.
dhu%d: DIAG. FAILURE
The DHQ11 failed the diagnostics that run at initialization time.
dhu%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 ele-
vated priority. Interrupts are disabled, and the system then prints a message on the console.
dhu%d: DHU HARDWARE ERROR. TX.DMA.START failed
The dhq failed to clear the start bit. Normally, this is cleared to signal that a DMA transfer has completed.
Files
Dialups
See Also
tty(4), MAKEDEV(8)
dhq(4)