1. It's true that expression:
data=*v++;
it's the same thing as
data=*(v+1);

2, It wouldn't be fair to declare void disp_string(char *v) as
void disp_string(unsigned char *v), just because type of "ch" array is unsigned char ?

3. It's true that using a global where a local variable will do makes a function less general because it relies on something that must be defined outside itself ?
Thus, why use global variable as "data" is, and not relies on return type of function:
unsigned char disp_string(unsigned char *v)
return *v++;
Since the return is done through stack, that makes sense for 1KB stack reserved space of Dallas 80C390.
Cute, isn't !!!


Regards,
Silviu