UPI-452 Overview
UPI-452 CHMOS PROGRAMMABLE I O PROCESSOR 83C452 - 8K c 8 Mask Programmable Internal ROM 80C452 - External ROM EPROM Y 83C452 80C452 3 5 to 14 MHz Clock Rate Software patible with the MCS-51 Family 128-Byte Bi-Directional FIFO Slave Interface Two DMA Channels.