To add the resmac instruction

[djipi]

Multiply/Accumulate Result Write

Takes the current contents of the result register and writes them to the register indicated. Intended to be used as the final instruction of a multiply/accumulate group.
*- refer to the section on Multiply and Accumulate instructions

Code/Case: 19

Flags
ZNC - unaffected

Register Usage
Cycle 3: Destination register write