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"z80-instruction-set.z80Link": Link to Z80 documentation. You can change this e.g. to point to some other html documentation. This simply adds a link to all The Z80 Instruction Decoder and Disassembler · The byte lengths of the instructions are not fixed. Each instruction size varies from one to two bytes. · OpcodesDeciphering Zilog Z80 die shot into discrete logic gates. The instruction register (IR) is located between the instruction decode PLA and the internal Test bit. Instruction Register and CPU Control. As each instruction is fetched from memory, it is placed in the Instruction Register and decoded. The instruction decoder is one of the most complex and least regular logic structures in a modern processor that attempts to process multiple variable-length The opcode (operation code) is a single byte whose bit pattern indicates the operation we need the Z80 to perform (register loading, arithmetic, I/O, etc.). The