character   block    description
---------   -----    -----------
    1         1      CS80 disc
    6         6      HP9895 flex disc
    8         8      HP82901, HP82902 flex disc
    9         9      HP9885 flex disc
   10        10      memory disc
   11        11      HP7971 nine-track magnetic tape
   12        12      HPIB
   14        14      ciper printer
   15        15      /dev/null
   18        18      GPIO
   19        19      HP27128, HP27130 raw RS-232
   20        20      /dev/tty
   22        22      HP-UX printer
   26        26      raw 9020 thermal printer
   28        28      9020 graphics for 98770/80A
   29        29      9020/98700 console, HP27140 terminal interface, slave pty
   31        31      HP27128, HP27130 terminal interface
   32        32      graphics for 98760A/97062A
   33        33      SRM option
   34        34      HP2285 ETHERNET device
   35        35      HP2680, HP2688 laser printer
   36        36      HP7974, HP7978 nine-track magnetic tape
   37        37      HP9050 INTERNAL HP-IB
   38        38      HP27125 ETHERNET device
   39        39      HP27125 IEEE 802 device
   40        40      HP2285  IEEE 802 device
   41        41      HP98700 raw 8042 HIL
   42        42      HP98700 HIL
   43        43      HP98700 HIL cooked keyboards
   45        45      master pty
