TGA_VALID_REG
TGA_WRITE_REG(par, TGA_VALID_VIDEO | TGA_VALID_BLANK, TGA_VALID_REG);
TGA_WRITE_REG(par, TGA_VALID_VIDEO, TGA_VALID_REG);
vvvr = TGA_READ_REG(par, TGA_VALID_REG);
TGA_WRITE_REG(par, vvvr | TGA_VALID_VIDEO, TGA_VALID_REG);
TGA_VALID_REG);
TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);
TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);
TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);