BT459_ADDR_LO
dac_write(par, BT459_ADDR_LO, regno);
dac_write(par, BT459_ADDR_LO, 0x00);
dac_write(par, BT459_ADDR_LO, regno);
dac_write(par, BT459_ADDR_LO, 0x00);
TGA_WRITE_REG(par, BT459_ADDR_LO << 2, TGA_RAMDAC_SETUP_REG);