Computer Interface를 위한 Micro-program에 관한 고찰 = A Study on Micro-program for Computer Interface

다국어 초록 (Multilingual Abstract)

The input-output subsystem of a computer provides an efficient mode of communication between the central system and the outside environment. Programs and data must be entered into computer memory for processing and results obtained from computation must be recorded or displayed for the user.
Input-Output(I/O) interface provides a method for transferring binary information between internal storage, such as memory and CPU register, and external I/O devices. Peripherals connected on-line to a computer need special communication links for interfacing them with the contral processor. The purpose of the communication link is to resolve the differences that exist between the central computer and each peripheral.
Microprogramming has many economic advantages. Although hard-wired logic is a more economical way of implementing very simple systems, as the complexity of the system increases, the cost of the control logic increases at a fairly rapid rate. In microprogrammed implementations, the cost of the simplest system in somewhat higher, but adding new features only requires additional control memory.
In general, replacing most of the control logic with a ROM affords substantial hardware savings because of the high-density packaging of ROM arrays.