This chapter discusses the following functions:
The hardware needed to use these functions includes:
Most people do not understand the nightmares that some computer users previously had when adding peripherals. When the PC originally shipped, it did not have a mouse as standard; you needed to buy that separately. It came with a keyboard, but that is about it. The keyboard was a standard element to computers, and it still is. Since there is no need to have two keyboards connected to a computer, each PC came with a single keyboard connector, the DIN keyboard connector. It was large and bulky, and kept the connector firmly in place. Then manufacturers decided to add a mouse. Mice were normally sold with a serial connector, the highly reliable RS-232 connector. Because most computers were sold with two serial ports and one parallel port, that was easy. It left ports free.
Suppose the user wanted to add a printer. Printers were almost always connected to parallel ports, but the computer had only one. Then a 56-k modem connected to the remaining serial ...