Mailing system peripheral interface with replaceable prom for accessing memories

摘要

An interface between a system processor of an automated mailing system and selected peripheral devices carries peripheral support hardware and software for communication with the peripherals. The interface includes a board having a memory wherein programs for formatting communications with the peripherals are stored. A working memory for the temporary storage of commands and data for communication to the peripherals and a peripheral controller for establishing a communications link with a selected peripheral are also carried on the interface board. A replaceable PROM is carried on the interface for accessing the output enable pins of the program and working memories. The PROM is replaced in the field when a different program or working memory is to be substituted.