45. A method, comprising: retrieving from an address table stored in a memory an address of a first group of sequential first code words and a length of at least a first one of the first code words; retrieving from the memory the first one of the first code words in response to the address and the length; retrieving from the memory one of a group of sequential second code words each having a same length, the one second code word corresponding to the first one of the first code words; and obtaining a first software-programming instruction from the retrieved first and second code words.
45. A method, comprising: retrieving from an address table stored in a memory an address of a first group of sequential first code words and a length of at least a first one of the first code words; retrieving from the memory the first one of the first code words in response to the address and the length; retrieving from the memory one of a group of sequential second code words each having a same length, the one second code word corresponding to the first one of the first code words; and obtaining a first software-programming instruction from the retrieved first and second code words. 53. The method of claim 45 , further comprising: retrieving from the memory another second code word immediately following the previously retrieved one second code word and having no corresponding first code word; and obtaining a second software-programming instruction equal to the first software-programming instruction in response to the other second code word.