re: 2 posts before:
u r right ff=255 but f=15
Formula:
ffffffff.......(n * f) ==15*16^(n-1)+15*16^(n-2)+.......+15*16^0(x^0 allways ==1) in dec
0xf=15(dec)
0xff=255(dec)
oxfff=4095(dec)........
istead of f u can use any number supported by hex code (123456789abcdef) instead of 15*.... u will use proper dec number(123456789101112131415).
I suggest using calc or other prog to avoid mistakes cuz ppl make mistakes, calcs only if ppl enter bad data
peace