1. A computer terminal for connection to a host computer, said terminal including a plurality of input/output devices, an information storage comprising a buffer area and an input/output area, and a terminal processor for controlling operation of said terminal wherein, the improvement comprises: an operation table in said information storage, said table including a list of instructions loaded into said table from said host computer, each of said instructions having a condition field, said instructions being sequentially accessed and selectively executed by said terminal processor for controlling the operation of said input/output devices; a condition register in said information storage for storing condition flags to be compared by said terminal processor with condition flags in said condition field of said instructions before an operation specified by an operation code in said instructions is allowed to be executed by said terminal processor; a plurality of operation indicators stored in said information storage, each operation indicator settable by said terminal processor as said operation code of a corresponding one of said instructions is executed, said operation indicators controlling data transfer between said input/output area and said plurality of input/output devices by said terminal processor asynchronously with execution of said instructions in said operation table.