Locating code at a certain address

Well,
Andrew Neil asked a good question - why do you need with fixed address?
For simple example, you have 4 tables of coefficients, each one contains 8 bytes. So then do something like (put your values here):

unsigned char code tables[4][8] =
{
{1,2,3,4,5,6,7,8},
{11,12,13,14,15,16,17,18},
{31,32,33,34,35,36,37,38},
{71,72,73,74,75,76,77,78},
};

unsigned char *current_table;
switch (redefine_condition)
{
case condition_1: current_table=tables[0]; break;
case condition_2: current_table=tables[1]; break;
case condition_3: current_table=tables[2]; break;
case condition_4: current_table=tables[3]; break;
}

Well,
Andrew Neil asked a good question - why do you need with fixed address?
For simple example, you have 4 tables of coefficients, each one contains 8 bytes. So then do something like (put your values here):

unsigned char code tables[4][8] =
{
{1,2,3,4,5,6,7,8},
{11,12,13,14,15,16,17,18},
{31,32,33,34,35,36,37,38},
{71,72,73,74,75,76,77,78},
};

unsigned char *current_table;
switch (redefine_condition)
{
case condition_1: current_table=tables[0]; break;
case condition_2: current_table=tables[1]; break;
case condition_3: current_table=tables[2]; break;
case condition_4: current_table=tables[3]; break;
}