Keyboard Port Attachment
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
This article describes a keyboard port attachment which provides a low cost interface to a personal computer (PC) for low speed serial input devices without using a card slot or attachment card. The keyboard port attachment described herein allows a user to interface certain devices to the IBM PC without using a card slot or an attachment card. The keyboard port attachment is a serial bidirectional four-wire interface which may be adapted for use by a low-speed serial device. The interface also includes a +5 volt power line which powers the serial device. The PC keyboard may coexist with the serial device on the port, although data transfers are non-concurrent. The keyboard port attachment is illustrated in the drawing.