(as) Z80 Opcodes

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 9.36.5 Opcodes
 --------------
 
 In line with common practice, Z80 mnemonics are used for both the Z80
 and the R800.
 
    In many instructions it is possible to use one of the half index
 registers (`ixl',`ixh',`iyl',`iyh') in stead of an 8-bit general
 purpose register. This yields instructions that are documented on the
 R800 and undocumented on the Z80.  Similarly `in f,(c)' is documented
 on the R800 and undocumented on the Z80.
 
    The assembler also supports the following undocumented
 Z80-instructions, that have not been adopted in the R800 instruction
 set:
 `out (c),0'
      Sends zero to the port pointed to by register c.
 
 `sli M'
      Equivalent to `M = (M<<1)+1', the operand M can be any operand
      that is valid for `sla'. One can use `sll' as a synonym for `sli'.
 
 `OP (ix+D), R'
      This is equivalent to
 
           ld R, (ix+D)
           OPC R
           ld (ix+D), R
 
      The operation `OPC' may be any of `res B,', `set B,', `rl', `rlc',
      `rr', `rrc', `sla', `sli', `sra' and `srl', and the register `R'
      may be any of `a', `b', `c', `d', `e', `h' and `l'.
 
 `OPC (iy+D), R'
      As above, but with `iy' instead of `ix'.
 
    The web site at `http://www.z80.info' is a good starting place to
 find more information on programming the Z80.
 

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