O'Reilly logo

Computer Busses by William Buchanan

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

16

Parallel Port

16.1 Introduction

This chapter discusses parallel communications. The Centronics printer interface transmits eight bits of data at a time to an external device, normally a printer. A 25-pin D-type connector is used to connect to the PC and a 36-pin Centronics interface connector normally connects to the printer. This interface is not normally used for other types of interfacing as the standard interface only transmits data over the data lines in one direction, that is, from the PC to the external device. Some interface devices overcome this problem by using four of the input handshaking lines to input data and then multiplexing using an output handshaking line to multiplex them to produce eight output bits.

As technology has improved ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required