Ternary Computer:

A ternary computer works on digits 0,1,2. This means that a trit 
can store 1 value more than a bit can.

For two bits the values of number increase as:
  00 represents decimal 0
  01   "             "  1
  10   "             "  2
  11   "             "  3

For a trit therefore, the values will be:

  00 represents decimal 0
  01   "          "     1
  02   "          "     2
  10   "          "     3
  11   "          "     4
  12   "          "     5
  20   "          "     6
  21   "          "     7
  22   "          "     8

This way 2-trits will represent 3^2 numbers and 8-trits will 
represent 3^8=6561 numbers