Info Catalog
as: Z80-Regs
as: Z80 Syntax
9.55.2.3 Case Sensitivity ......................... Upper and lower case are equivalent in register names, opcodes, condition codes and assembler directives. The case of letters is significant in labels and symbol names. The case is also important to distinguish the suffix 'b' for a backward reference to a local label from the suffix 'B' for a number in binary notation.