What is the text adventure being played in this photograph?
The computer is a HP 2647A Graphics Terminal, and the text visible on screen is:
of the road is a 500 foot sheer cliff,over looking the sea shore. The road ends here but the wall continues west into the dense forest. >ENTER GATE You are in the gargoyle garden. There is a way to go north >GO DOWN PATH My input vocabulary doesn't include the word PATH >LOOK You are in the gargoyle garden. There is a way to go west High hedges block the view around you but you can see some of the gargoyles along the roof of the mansion. There are paths going in several directions. >_
It’s Mystery Mansion given the mainframe in question and the time frame. The reference to mansion in the bottom paragraph gives it away. Additionally this is confirmed by going through the game’s source code, specifically the FORTRAN .f file:
58 FORMAT(/" HIGH HEDGES BLOCK THE VIEW AROUND YOU BUT YOU CAN SEE ", 1"SOME OF THE"/" GARGOYLES ALONG THE ROOF OF THE MANSION. THERE ", 2"ARE PATHS GOING IN SEVERAL"/" DIRECTIONS.")