Solution:
Increase the number of Pseudo TTY's on the system through SCOADMIN -> hardware / kernel Manager to at least 256.
Manually edit the /etc/conf/cf.d/mdevices file :
Look for the tps entries, there will be two lines that could appear as such:
tps Iocrwi Bictk tps_ 0 144 0 256 -1
tps Iocrwi BictkM tps_ 0 145 144 256 -1
then add the following two lines:
tps Iocrwi BictkM tps_ 0 146 144 512 -1
tps Iocrwi BictkM tps_ 0 147 144 768 -1
The /etc/conf/node.d/mpt and spt files should have entries extending to device 255, if not then create new entries sequentually.
mpt ptyp0 c 0
...
mpt ptyp255 c 255
Copy the tpm, and tps files into the /etc/conf/node.d directory. (see the Downloads link below).
after these files are copied a idbuild must be issued to create the devices and rebuild the kernel:
# /etc/conf/bin/idbuild
Note: on some hosts the Unix Domain Sockets (/etc/conf/sdevice.d/sockets) may have to be increased to support the additional sockets.