Вот такая вот штука попалась, пока превращал биос в исходники:
void _fz1_ADBInit()
{
static const unsigned int buff[]={0,8,0xf0,0x32,0x68,6,0x55,2,0x10,4,0xc,0xc,3};
int i;
//инициализация VideoDAC???
_clio_Write(0x88,1); //ADBCTL - 01=24 bit Brooktree Interface
_clio_Write(0x84,0x10); //ADBIO - dir is out, PAD - NTSC, WD off, RAM on?
_clio_Write(0x84,0x11); //переключение на PAL ???
_space_Write(0x3100008,0xff);
_space_Write(0x3100008,0xff);
_space_Write(0x3100008,0xff);
_space_Write(0x3100000,0);
for(i=0;i<sizeof(buff)/sizeof(buff[0]);i++) _space_Write(0x3100018,buff[i]);
_space_Write(0x3100000,0);
for(i=0;i<256;i++) //шкала яркости
{
_space_Write(0x3100004,i);
_space_Write(0x3100004,i);
_space_Write(0x3100004,i);
}
}