The
ppi interface provides a means of communication with HP-IB printers and plotters.
Special files
ppi0 through
ppi7 are used to access the devices, with the digit at the end of the filename referring to the bus address of the device. Current versions of the autoconf code can not probe for these devices, so the device entry in the configuration file must be fully qualified.
The device files appear as follows:
"crw-rw-rw- 1 root 11, 0 Dec 21 11:22 /dev/ppi"