If they are on the same side of the quasars as us-then your approach works-but if they live on the opposite side of these objects, they'll deduce that we send our pictures as raster scans that go right to left and top to bottom or left to right and bottom to top-and you'll have inadvertently switched clockwise from anticlockwise and left from right.
32.
This can and does introduce a noticeable shift in the trajectory of the beam, which must be compensated for by the controlling electronics, else the raster scan doesn't work properly . ( Reference : " Cathode Ray Tubes ", R . Casanova Alig, Sarnoff Corporation, 1999 ) . " The electrons leave the gun at speeds of 5 % or more of the speed of light.
33.
CALLing another address gave a forced system reset ( call 0 ), the famous " Press Any Key " ( call & bb18 ) or for eliminating flicker in animation by allowing you to synchronize with the monitor's raster scan via " sync frame-flyback " ( call & bd19 ); this was given its own dedicated command in Basic 1.1-FRAME . With PEEK and POKE, CALL provided an interface to assembly language programming from BASIC.
