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dear ezflyin
well I solved the problem, it was extremely simple, and you did not need to know anything more than my first comment to solve it.
Thank you very much for you help
take care

I can't give you a small code,
I need to give you the entire code because it's not independant, and the isis file too

the problem is simple the after 256 it goes back to 0 :
a[0] a[1]...... a[255] a[0] a[1] instead of going to a[256] a[257]

this is a small compilable function, just put it in a main.
if you want something more simple just see the example I've putter about (the a[i] = i/2)

for(i=0 ; i < 89 ; i++)
{

if((MyStr[i]>='A') && (MyStr[i]<='Z' ))
for(j=0 ; j< 6 ; j++ )
tab[(i*6&# ...

well this is the original example,
if I change the max value in the for loop from 89 to 42, the software works properly
but after 42, since 43*6 >256, I get problems

void displaystring(byte *PORT, byte Alphabet[40][6])
{
char MyStr[90] = "PLEASE FEAL FREE TO INSERT YOUR FINGER - WE ARE NOT RESPONSIBLE FOR WHAT MIGHT HAPPENS - " ;

byte tab[540];
byt ...

version 4.114
microchip pic18f4520

I am using pi18f4520, but I do not see how's that relevant since the problem is in the code, it compiles but what happens that:
when I store values :
for(i=0;i<300;i++)
a[i]=i/2;

the result w ...

Hi, I'm programming a pic,
and I have a table of byte: byte a[300];
but when I reach a[255] in a for loop
The table go back to a[0]
Any ideas ?

Thank You