Which game is this: you are in the gargoyle garden

Solution 1:

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.")

The game was remade for various systems including DOS and Android.