jbn@glacier.STANFORD.EDU (John B. Nagle) (05/13/87)
We have a SUN 3 in Computervision markings equipped with a Systech
printer controller, a device with a Versatec printer interface and a
Centronics interface. The driver "vpc" is supposed to drive this unit,
and autoconfigure finds it OK. Supposedly, minor device 0 is the Versatec
port and minor device 1 is the Centronics port, and MKNOD sets up /dev/vp0
and /dev/lp0 accordingly. Attempts to access /dev/vp0 produce "I/O Error"
(correctly, there not being anything plugged into the Versatec port) but
attempts to open /dev/lp0 produce "No such device or address". This
is puzzling; the "vpc" manual page indicates that both are always found
together.
Anyone know how to bring this thing up?
John Nagle
Center for Design Research, Stanford.
(I miss the good old days, when you looked at the source code and the
circuit diagrams and figured out how it worked.)