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video tests ----------- These tests run the entire Atari ST video subsystem through a verilator simulation. The screen is simulated using a SDL window. In video_tb.cpp several things can be configured: DUMP -- enable signal dump. Slows down simulation VIKING -- enable simulated viking video card REZ -- shifter resolution LOW=0, MID=1, HI=2 SD -- scan doubler on/off SL -- scanlines 0=off -> 3=75% PAL -- enable 1-PAL or 0-NTSC PAL56 -- use 56Hz PAL video modes Different modes to be tested: LOWREZ PAL50 without scan doubler LOWREZ PAL50 with scan doubler LOWREZ PAL56 without scan doubler LOWREZ PAL56 with scan doubler LOWREZ NTSC without scan doubler LOWREZ NTSC with scan doubler MIDREZ PAL50 without scan doubler MIDREZ PAL50 with scan doubler MIDREZ PAL56 without scan doubler MIDREZ PAL56 with scan doubler MIDREZ NTSC without scan doubler MIDREZ NTSC with scan doubler HIREZ VIKING