Z-80 OpCode Formation Rules:
Introductory note -- Binary form of opcodes
Example: LD r,r'
the 8-bit binary opcode is
01dddsss
...where "ddd" is a three-bit field specifying the destination,
and "sss" is a three-bit field specifying the source.
is shown below as
r r'
01 xxx xxx
Detailed info LD
Instruction Format:
OPCODE r r' CYCLES
----------------------------------------------------
01 XXX XXX LD r,r' dst,src 4
Register r,r'
--------------
A = 111
B = 000
C = 001
D = 010
E = 011
H = 100
L = 101
read more about this in the z80syntx.htm
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