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Instruction Structure

 
  
Figure 1: Structure of Instructions
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OP-Code
The code of an operation. See section Opcodes.
D
Mark for double-word instructions. The data is in the next word if this bit is set. An Exception are the operations on the stack where this bit is a part of the modification part.
MOD
Modification part. With these bits addressing modes, stack- and indexoperations are selected.
Address / Value
In this part the data belonging to the operation is stored.


Markus Hennecke
9/14/2003