APPLICATION OF MICRO-COMPUTER TO ON-LINE DATA TERMINAL.

A 4-bit 1-chip micro-computer (MN1400) has been applied to an economical on-line data terminal. This article describes this terminal which includes a keyboard, an acoustic coupler and a thermal printer. It has the following functions: transmission of inquiry messages from the keyboard to the center computer of a telephone line and printing answer messages from the center computer. Commonly, 8-bit micro-computers have been used for such character data handling applications, but 4-bit 1-chip micro-computers are more feasible.