The coding of space and the most common 7 characters uses 4 bits; of the next 8, 5 bits and of the remaining 32, 7 bits. The average is 5.2 bits. Within each octet, the more frequent characters are assigned the most trailing zeros. Up to 5 trailing zeros can be appended to the last (rightmost) character in a word.
Each character also has a corresponding 6-bit index into a table of graphics. There are 48+26+12 entries that include capital letters. These 16x24 bit-maps are edited by a utility called 'icon'.
0 000 0 10 000 s 8 1100 000 d 16 0 001 r 1 10 001 m 9 1100 001 v 17 0 010 t 2 10 010 c 10 1100 010 p 18 0 011 o 3 10 011 y 11 1100 011 b 19 0 100 e 4 10 100 l 12 1100 100 h 20 0 101 a 5 10 101 g 13 1100 101 x 21 0 110 n 6 10 110 f 14 1100 110 u 22 0 111 i 7 10 111 w 15 1100 111 q 23 1101 000 k 24 1110 000 8 32 1111 000 ; 40 1101 001 z 25 1110 001 9 33 1111 001 : 41 1101 010 j 26 1110 010 1 34 1111 010 ! 42 1101 011 3 27 1110 011 - 35 1111 011 + 43 1101 100 4 28 1110 100 0 36 1111 100 @ 44 1101 101 5 29 1110 101 . 37 1111 101 * 45 1101 110 6 30 1110 110 2 38 1111 110 , 46 1101 111 7 31 1110 111 / 39 1111 111 ? 47