NAME

psp − planar serial port RS232C interface

SYNOPSIS

device psp0 at iocc0 csr 0xf0008000 flags 0x03 priority 2

DESCRIPTION

The floor-model IBM RT PC comes with two planar serial ports with full modem control; the desk model does not.  Each port behaves as described in tty(4) and may be set to run at any of 16 speeds; see tty(4) for the encoding.

Bit i of flags may be set to 1 to specify that the ith port should be treated as having carrier initially present. For example, specifying “flags 0x01” in the configuration entry for psp0 causes only the line ttys0 to be treated in this way.

Note that /dev/ttys1 corresponds to the port labeled “S1” and /dev/ttys0 corresponds to the port labeled “S2” on the back of the IBM RT PC. 

NOTES

Psp is not supported on the IBM 6152 Academic System. 

FILES

/dev/ttys[01]

SEE ALSO

tty(4)

DIAGNOSTICS

psp%d: overrun error.  Data has been lost because characters are arriving at the adapter faster than the driver can read them. 

PRPQs 5799-WZQ/5799-PFF: IBM/4.3  —  July 1987