its set screen_size parameter to 1600x900
also you can set it by x and y parameter

http://www.conitec.net/beta/ascreen_size.htm

and you can check video_mode function

http://www.conitec.net/beta/avideo_mode.htm


PS- techdemo_a6 used C-Script, its very old programming language.
some information about how convert C-Script code to Lite-C

http://www.coniserver.net/coni_user....html?information_for_the_a5_engine_.htm

http://www.conitec.net/beta/litec_migration.htm


If you are just starting to work with 3DGS, then I highly recommend studying only Lite-C