opcode

op +‎ code (in sense of operation)

opcode (plural opcodes)

1. (computing) A mnemonic used to refer to a microprocessor instruction in assembly language.
   • 1992, Michael A. Miller, The 68000 Microprocessor Family: Architecture, Programming, and Applications (page 47)

     When the microprocessor decodes the JSR opcode, it stores the operand into the TEMP register and pushes the current contents of the PC ($00 0128) onto the stack.

   • 2010, Andrew Troelsen, Pro C# 2010 and the .NET 4 Platform (page 655)

     In the tradition of other low-level languages, many CIL opcodes tend to be cryptic and completely unpronounceable by us mere humans.

• co-oped, cooped