20. A translator for translating input data characters in a first code into output data characters in a second code, said first code including some characters for which there are no equivalent translated characters in said second code, said translator comprising: memory means, means for applying input data characters to said memory as addressing signals; said memory means having stored therein, in said second code, translations of some characters of said first code; said memory means also having stored therein, at each location addressable by a character in said first code, an indication of whether or not there is an equivalent character in said second code, sensing means for sensing said indication for the addressed location each time said memory means is addressed by an input data character; gating means responsive to said memory means and said sensing means for blocking the output from said memory means when said sensing means senses an indication that there is no equivalent character in said second code corresponding to the input data character.
20. A translator for translating input data characters in a first code into output data characters in a second code, said first code including some characters for which there are no equivalent translated characters in said second code, said translator comprising: memory means, means for applying input data characters to said memory as addressing signals; said memory means having stored therein, in said second code, translations of some characters of said first code; said memory means also having stored therein, at each location addressable by a character in said first code, an indication of whether or not there is an equivalent character in said second code, sensing means for sensing said indication for the addressed location each time said memory means is addressed by an input data character; gating means responsive to said memory means and said sensing means for blocking the output from said memory means when said sensing means senses an indication that there is no equivalent character in said second code corresponding to the input data character. 22. A translator as claimed in claim 20 wherein said gating means includes means responsive to said memory means and said sensing means for passing the output of said memory means when said sensing means senses an indication that the input data character has an equivalent character in said second code.