Step-by-step explanation:
One of the main issues faced by multicore processors running older software written for single-brain chips is that the software is not optimized to take advantage of the additional cores. This can lead to decreased performance and inefficiency when running the software on a multicore processor. Additionally, older software may not be designed to handle the complexities of multitasking, which can lead to instability. Finally, certain programs may not recognize the multiple cores and thus may not be able to take advantage of them.