ct(4) Unsupported ct(4)Namect - phototypesetter interface
device ct0 at uba0 csr 0167760 vector ctintr
This provides an interface to a Graphic Systems C/A/T phototypesetter.
Bytes written on the file specify font, size, and other control infor‐
mation as well as the characters to be flashed. The coding is not
Only one process may have this file open at a time. It is write-only.
Phototypesetter interface specification