The Intel® 8755A is an erasable and electrically reprogrammable ROM (EPROM) and I/O chip to be used in the MCS-85™ and MCS-48™ microcomputer systems. The PROM portion is organized as 2048 words by 8-bits. It has a maximum access time of 400ns to permit use with no wait states in an 8085A CPU.
The I/O portion consists of 2 general-purpose I/O ports. Each port has 8 port lines, and each I/O port line is individually programmable as input or output.