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The first ATA drives connected to the computer with a 40-pin ribbon cable that plugged into the drive and to a hard drive controller The cable has a colored stripe down one side that denotes pin 1 and should connect to the drive s pin 1 and to the controller s pin 1 Figure 913 shows the business end of an early ATA drive, with the connectors for the ribbon cable and the power cable The controller is the support circuitry that acts as the intermediary between the hard drive and the external data bus Electronically, the setup looks like Figure 914 Wait a minute! If ATA drives are IDE (see the Tech Tip), they already have a built-in controller Why do they then have to plug into a controller on the motherboard Well, this is a great example of a term that s not used properly, but everyone (including the motherboard and hard drive makers) uses it this way What we call the ATA controller is really no more than an interface providing a connection to the rest of the PC system When your BIOS talks to the hard drive, it Figure 913 Back of IDE drive showing 40-pin connector (left), jumpers (center), and actually talks to the onboard cirpower connector (right) cuitry on the drive, not the connection on the motherboard But, even though the real controller resides on the hard drive, the 40-pin connection on the motherboard is called the controller We have a lot of misnomers to live with in the ATA world! The ATA-1 standard defined that no more than two drives attach to a single IDE connector on a single ribbon cable Because up to two drives can attach to one connector via a single cable, you need to be able to identify each drive on the cable The ATA standard identifies the two different drives as master and slave You set one drive as master and one as slave using tiny jumpers on Figure 914 Relation of drive, controller, and bus the drives (Figure 915).

An Epson FX-880+ dot-matrix printer (photo courtesy of Epson America, Inc)

The controllers are on the motherboard and manifest themselves as two 40-pin male ports, as shown in Figure 916

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If you re making a hard drive standard, you must define both the method and the speed at which the data s going to move ATA-1 defined two different methods, the first using programmed I/O (PIO) addressing and the second using direct memory access (DMA) mode

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Inkjet printers (also called inkdispersion printers) like the one in Figure 153 are relatively simple devices consisting of a printhead mechanism, support electronics, a transfer mechanism to move the printhead back and forth, and a paper feed component to drag, move, and eject paper (Figure 154) They work by ejecting ink through tiny tubes Most inkjet printers use heat to move the ink, while a few use a mechanical method The heat- method printers use tiny resistors or electroconductive plates at the end of each tube (Figure 155), which literally boil the ink; this creates a tiny air bubble that ejects a droplet of ink onto the paper, thus creating portions of the image The ink is stored in special small containers called ink cartridges Older inkjet printers had two cartridges: one for black ink and another for colored ink The color cartridge had separate compartments for cyan (blue), magenta (red), and yellow ink, to print colors using a method known as CMYK (you ll read more about CMYK later in this chapter) If your color cartridge ran out of one of the colors, you had to purchase a whole new color cartridge or deal with a messy refill kit Printer manufacturers began to separate the ink colors into three separate cartridges, so that printers

PIO is nothing more than the traditional I/O addressing scheme, where the CPU talks directly to the hard drive via the BIOS to send and receive data Three different PIO speeds called PIO modes were initially adopted:

DMA modes defined a method to enable the hard drives to talk to RAM directly using old-style DMA commands (The ATA folks called this single word DMA) This old-style DMA was slow, and the resulting three ATA single word DMA modes were also slow:

A standard telephone connection comprises many pieces First, the phone line runs from your phone out to a network interface box (the little box on the side of your house), and into a central switch belonging to the telephone company Standard metropolitan areas have a large number of central offices, each with a central switch These central switches connect to each other through high-capacity trunk lines Before 1970, the entire phone system was analog Today, the entire telephone system, with the exception of the line from your phone to the central office, is digital By adding special equipment at the central office and the user s location, phone companies can now achieve a throughput of up to 64 K per line over the same copper wires already used by telephone lines This process of sending telephone transmission across fully digital lines end-to-end is called integrated services digital network (ISDN) service ISDN service consists of two types of channels: Bearer, or B, channels and Delta, or D, channels B channels carry data and voice information at 64 Kbps D channels carry setup and configuration information and carry data at 16 Kbps Most providers of ISDN allow the user to choose either one or two B channels The more common setup is two B/one D, usually called a basic rate interface (BRI) setup A BRI setup uses only one physical line, but each B channel sends 64 Kbps, doubling the throughput total to 128 Kbps The big limitation is that you usually need to be within about 18,000 feet of a central office to use ISDN The physical connections for ISDN bear some similarity to analog modems An ISDN wall socket usually looks something like a standard RJ-45 network jack The most common interface for your computer is a device called a terminal adapter (TA) TAs look much like regular modems, and like modems, they come in external and internal variants.

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