 There were several loops
in the microcode that were a single instruction long and many of the simpler p-code ops took 1 or 2 microcode instructions.With the wide microword and the way the busses were carefully arranged, as well as incrementing memory address registers, the cpu could execute operations inside the ALU while transferring a memory word directly to the onboard stack, or feed one source into the ALU while sending a previously computed register to the destination bus in a single microcycle.The cpu ran at three different clock speeds (using delay lines for a selectable clock); two bits in the microword selected the cycle time for that instruction.