ISPCVT (8) | System administration commands and daemons | Unix Manual Pages

The options are as follows:

-d	Specifies a device for which the check is done.
-v	Specifies being verbose. On success the name and revision is reported, on failure which comparison failed.
-n	print the number of compiled-in virtual terminals.
-c	This options prints out the values of all "PCVT_XXXXXX" #defines which were given to the compiler at the time the currently running kernel was compiled. Specifying -v with the -c option gives a verbose listing of the compile-time options.

0	driver is pcvt and major and minor numbers match
1	open(2) or ioctl(2) system call failed
2	driver name mismatch
3	name matched, release major number mismatch
4	name and major number matched, release minor number mismatch
5	usage error