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The following index instructions have the opcode 1111 and are selected
via the MOD part. They have no parameters with exception of the LDX
instruction because all operate the index register direct.

- CLI
- Load zero to the index register.
- LDI
- Transfer the accumulator to the index register.
- LIA
- Transfer the index register to the accumulator.
- INK
- Increments the index register by one.
- DEK
- Decrements the index register by one.
- LDX
- Load value from an absolute address into the index
register. Only the direct addressing mode is possible. The
instruction is always a double-word instruction.
Markus Hennecke
9/14/2003