IN AXDX OUT DXAX MUL C AXC→DXAX

This code performs multiplication of the value in AX with a constant C. The result is stored in DX and AX registers.

Here's a step by step explanation of the code:

Load the value of C into a register, say BX.
Multiply the value in AX with the value in BX using the MUL instruction. This instruction multiplies the two values and stores the result in the DX:AX register pair.
Use the OUT instruction to output the value in DX:AX register pair to the output port specified in DX register.

So, the final code would look like this:

MOV BX, C    ; Load C into BX register 
MUL BX       ; Multiply AX with BX and store result in DX:AX 
OUT DX, AX   ; Output the result to the port specified in DX

Note: The actual value of C would need to be defined earlier in the program, either as a constant or by loading it into a register from memory.