The Rabbit is a near clone of the Zilog Z180. It has some missing instructions, mostly replaced with different instructions.

Z180 opcodes missing on the Rabbit

DAA, HALT, DI, EI, IM 0, IM 1, IM 2, OUT, IN, OUT0, IN0, SLP, OUTI, IND,
OUTD, INIR, OTIR, INDR, OTDR, TESTIO, MLT SP, RRD, RLD, CPI, CPIR, CPD,
CPDR, RST 00, RST 08, RST 30, CALL CC,dest, TST R ((HL),n)

Z180 opcodes changed on the Rabbit

EX (SP),HL    - old opcode  E3,  new opcode - ED 54

Z180 opcodes with different mnemomics on the Rabbit

LD A,R  -> LD A,EIR
LD R,A  -> LD EIR,A
LD I,A  -> LD IIR,A
LD A,I  -> LD A,IIR

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