Yes, the 186 microcode is remarkably similar to that of the original 8086, except for some encoding differences. Multiply/divide is now assisted by the ALU, so

Yes, the 186 microcode is remarkably similar to that of the original 8086, except for some encoding differences. Multiply/divide is now assisted by the ALU, so the microcode mainly has to set up the registers and do the check for zero divisor / overflow. There is also a final adjustment to the result, because the hardware uses a non-restoring algorithm that may underflow. And for signed division, the operands are converted to unsigned first and the result possibly negated at the end, using the F1 flag to store the sign like on the 8086. The 286's instruction decoder and microcode ROM are entirely different: 1536 words of 35 bits, with the entry point determined by a separate PLA.