Word-wrap buffer used by the game. Print_Character stores each letter here through *BufferPointer until a space, newline or quote; 43510 then prints those letters and resets the pointer to WordBuffer. It overlays the system variables from DEFADD onwards. The store path has no hard length check; the flush path treats the buffered length as an 8-bit count and compares it with the screen width at ScreenWidth (set to 18 or 36), so this block is sized to that maximum width (36).