1 1 9.56.2.3 Case Sensitivity 1 ......................... 1 1 Upper and lower case are equivalent in register names, opcodes, 1 condition codes and assembler directives. The case of letters is 1 significant in labels and symbol names. The case is also important to 1 distinguish the suffix 'b' for a backward reference to a local label 1 from the suffix 'B' for a number in binary notation. 1