Inputs: byte A[256], bit go
Outputs: byte avg, bit done
AVERAGE:
    while(1) {
        while(!go);
        done = 0;
        avg=0;
        sum=0;
        i=0;
        while ( i < 256 ) {
            sum = sum + A[i];
            i = i + 1;
        }
        avg = sum / 256;
        done = 1;
    }