Multiple port communications adapter apparatus

摘要: A multi-port communications controller and variable protocol adapter is described. The utilizes a user programmable pluggable programming cartridge for defining individual port data service characteristics. characteristics are interpreted by microprocessor which manages the interchange from to or memory host system. Direct access interrupt driven modes of operation individually selectable each in bound out channel. protocols employed at may be any standard type with making appropriate conversion. Communication speeds can automatically recognized matched also. An arbitration processor both DMA transfer services included as heart design provide capability individualized control over channel's mode optimum required.