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One 19-bit word represents a single character. The word is separated into three fields:
Bit number: 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
<------------> <------------------> <------------------>
Field: 1 2 3
Note that fields 2 and 3 hold 7 bits each, while field 1 holds 5 bits.
Character set Field 1 Field 2 Field 3 ------------- ------- ------- ------- ASCII 0 0 PC1 range: (00 - 7F) Control-1 0 1 PC1 range: (00 - 1F) Dimension-1 official 0 LB - 0x80 PC1 range: (01 - 0D) (20 - 7F) Dimension-1 private 0 LB - 0x80 PC1 range: (20 - 6F) (20 - 7F) Dimension-2 official LB - 0x8F PC1 PC2 range: (01 - 0A) (20 - 7F) (20 - 7F) Dimension-2 private LB - 0xE1 PC1 PC2 range: (0F - 1E) (20 - 7F) (20 - 7F) Composite 0x1F ? ?
Note that character codes 0 - 255 are the same as the “binary encoding” described above.