== Opcodes ==
We see that all CB-prefixed opcodes and half of the standard opcodes (from &40 to &BF) follow a strict uniform layout. The exception is the HALT instruction (opcode &76), which replaces the expected LD (HL),(HL) instruction.
The rest of the opcode table also looks neatly organised but in an horizontal way instead of vertical.
Any instruction in bold is undocumented by Zilog.