TV80

Undocumented instructions like RL (IX+1),E are not supported by TV80.

In real Z80 all instructions under CB can be prefixed by DD/FD. In result will be operation like: OP (II+d),r, where II is IX or IY, d - offset (-128...+127), r one of standard registers (A, B, C, D, E, H, L). This operations do something like: ld r,(II+d) OP r ld (II+d),r

OP can be: RLC, RL, RRC, RR, SLA, SRA, SRL, SLL, BIT, SET, RES

OpCode: DD CB dd oo, there CB oo is code of "OP r" operation.

If you can point me to some more extensive description I will look in to adding support for these opcodes. Are they documented in some of the other Z80 implementations? Is there an ISS which simulates these correctly?

I know only T80 implementation. Our developer fails to run it (some strange behaviour) so I cannot say has it support for these instructions or not. But using code examining I see there is no support (I am not a hardware developer - I am programmer, so I cannot guaranty fidelity of my assertion). I know: 1. Real Z80 and clones supports these operations 2. Behaviour of these operations equals to described above, except BIT.

<a href=http://www.z80.info/zip/z80-documented.pdf>here</a> is PDF document of all known undocumented instructions of Z80. Above instructions described on page 10: "3.5 DDCB Pre?x".