URI:
       Index of /pdf/digitalResearch/gsx
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   DIR /pdf/digitalResearch
       5000-2024_GSX_Graphics_Extension_Programmers_Guide_Sep83.pdf
       DR_Draw_Users_Guide_Mar84.pdf
       DR_Draw_Users_Guide_Suppliment_Dec83.pdf
       DR_Graph_Users_Guide_Jun83.pdf
       DR_Graph_Users_Guide_Supplement_for_the_IBM_PC_Jul83.pdf
       GSX-80_Graphics_Extension_Programmers_Guide_Nov82.pdf
       GSX-86_Graphics_Extension_Users_Guide_for_the_IBM_PC_Jul83.pdf
       GSX_Handbook_1984.pdf