A rare addition to the architecture of the Intel 386. In earlier 386s, this chip (which looked just like the main processor) was used to manage memory operations when a system was able to accept more then 8 megabytes of system memory. Very few systems had such technology in the mid to late 80's as adding the 385/caching technology was expensive. The job of the 385 later became a standard function of the motherboard's control chips.