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The Forbidden Fountain of Oz is a 1980 children's novel written by Eloise Jarvis McGraw and her daughter Lauren Lynn Mcgraw (or McGraw Wagner), and illustrated by Dick Martin. As its title indicates, the book is one entry in the long-running series of Oz books written by L. Frank Baum and his many successors.^[1][2][3]

The authors[edit]

The McGraws, mother and daughter, wrote an earlier Oz book, Merry Go Round in Oz, published in 1963. In their collaboration, the elder McGraw, a veteran children's book author, did the actual writing; she credited her daughter Lauren with story contributions. In Forbidden Fountain, the text is prefaced with an address to 'Dear Fans of Oz, Young, Old, and In-Between,' which calls Lauren Lynn McGraw 'Assistant Inventor and Head Trouble-Shooter,' while Eloise Jarvis McGraw signs herself as 'Chief of Bureau of Extraordinary Communications.'

The plot[edit]

A child named Emeralda Ozgood, a native of the Emerald City, prepares a concoction of limeade to celebrate the annual Clover Fair — but she naively uses water from the Forbidden Fountain. She only has one customer before she drops and breaks her pitcher; but that customer is Princess Ozma, who drinks the drink and loses her memory. Wandering off and losing her crown, Ozma falls in with a series of new acquaintances, including the Monarch of the Butterflies (who names her 'Poppy' after the flowers in her hair) and a talking hedgebird who advises her.

Outfitted in boy's clothes and hat, Ozma/Poppy meets a lamb named Lambert, who is ostracized from his Gillikin flock for his unnatural white color. The two stumble into Camouflage Creek, and undergo a bewildering string of transformations into bugs and beasts. Back in their own forms, they are confronted by an inept would-be highwayman named Tobias Bridlecull Jr., who quickly becomes the third member of their rambling trio. He carries a Suggestion Box that volunteers suggestions instead of receiving them — as in 'Suggest lunch' and 'Suggest oil for Suggestion Box.'

Returning home to Pumperdink from the Clover Fair, Kabumpo the Elegant Elephant falls into adventures of his own; he is waylaid by the animated toys of Wyndup Town. The elephant literally dumps into 'Poppy' and company among the bubblegum and mucilage geysers (or 'gozzers') of Gozzerland National Park. The four travelers combine, for further adventures in Cleanitupia and Pristinia. It is only when Kabumpo sees 'Poppy' with her long hair unconfined that he recognizes Ozma; then he needs to win the trust of the suspicious amnesiac and bring her home to the Emerald City. (He fails completely at the winning of trust, and hauls her back bodily.) Eventually, Ozma uses the Magic Belt to restore her memory and return to normal.

The Forbidden Fountain is sealed off forever, as a threat.

Details[edit]

The McGraws, like other Oz authors, have to make choices among the vast and sometimes contradictory details of life in Oz. They choose to give Oz a currency (of 'ozzos' and 'piozters'); but in the third chapter of The Emerald City of Oz, Baum specifically states that there is 'no such thing as money...' in Oz. (As the Tin Woodman says in the fifteenth chapter of The Road to Oz, 'Money in Oz!...What a queer idea!') Baum, however, was not wholly consistent in this detail (as in others), and the early books in the series do feature Oz currency.^[4]

Animals talk in the book; even insects do. Yet animals also eat each other: while transformed into talking dragonflies, 'Poppy' and Lambert eat their fill of 'what-gnats.' Later, a Purple Wolf wants to eat Lambert. This raises the vexing question of death in Oz.

Some of the book's action is set in a border region between the Gillikin Country and the Winkie Country, which allows a blending of the two regions' characteristic colors, purple and yellow. Lauren McGraw provided the book with a map that situates the Winkie Country in the western quadrant of Oz, as in Baum's original scheme.

Forbidden fountain[edit]

The forbidden fountain of the title is the same created by Baum in his sixth Oz book, The Emerald City of Oz — an enchanted fountain that purges the memories of all who drink its Water of Oblivion. In that book, the fountain provides the resolution of the plot conflict, through which the invading hordes of a barbarian army are defeated without violence. The fountain appears in later Oz books by Baum and his followers; it is significant in Baum's The Magic of Oz, Rachel Cosgrove Payes's The Wicked Witch of Oz, and Edward Einhorn's Paradox in Oz.

A rich imaginative heritage lies behind Baum's fountain. There is a 'forbidden fountain' in Welsh mythology, though instead of effecting drinkers' memories it expels them from fairyland, where it is located.^[5] The idea of forbidden drink is closely related to that of forbidden food, which occurs most famously in the 'forbidden fruit' of the Tree of Knowledge of Good and Evil in the Book of Genesis, but in other contexts too.

The idea of water that purges the drinker's memory is also ancient. In Greek mythology it occurs as the river Lethe: the souls of the dead lose their memories of their earthly lives by drinking its water. The same idea can also be found in Eastern and other literatures, as in the 'Well of the Waters of Forgetfulness'^[6] and other guises. 'The 'Drink of Forgetfulness' is found in Greek, Hindu, Norse, and other mythologies.'^[7] The concept received an eighteenth-century expression in James Ridley's The Tales of the Genii (1764), and from there made its way into drama and even to the visual arts, in John Martin'sSadak in Search of the Waters of Oblivion (1812).

Baum, however, made a noteworthy innovation in giving his Water of Oblivion a moral dimension. In his fantasy universe, those who drink from the Forbidden Fountain not only lose their recollections but become benign, 'as innocent as babes.' (Though this is irrelevant to Princess Ozma, who was benign to begin with.)

References[edit]

1. ^Paul Nathanson, Over the Rainbow: The Wizard of Oz as a Secular Myth of America, Albany, NY, State University of New York Press, 1991.
2. ^Suzanne Rahn, The Wizard of Oz: Shaping an Imaginary World, New York, Twayne, 1998.
3. ^Michael O'Neal Riley, Oz and Beyond: The Fantasy World of L. Frank Baum, Lawrence, KS, University Press of Kansas, 1997.
4. ^Eric Gjovaag, 'Money in Oz! What a Queer Idea!,' The Baum Bugle, Vol. 39 No. 3 (Winter 1995), pp. 13-15.
5. ^W. Jenkyn Thomas, The Welsh Fairy Book, London, T. Fisher Unwin, 1907; Whitefish, MT, Kessinger Publishing, 2004; p. 62-3.
6. ^S. Weir Mitchell, 'Little Stories: IV. The Waters of Oblivion,' The Century Illustrated Monthly Magazine, Vol. LXIV / New Series Vol. XLII (May to October 1902), pp. 40-2.
7. ^James Hastings, John A. Selbie, et al., eds., Encyclopedia of Religion and Ethics, Vol. 9, New York, Charles Scribner's Sons, 1908; Whitefish, MT, Kessinger Publishing, 2003; p. 78.

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Microsoft Computer Dictionary, Fifth Edition

n. A standard super VGA computer display having a resolution of 1024 columns of pixels by 768 rows of pixels. See also SVGA.

10Base2

n. The Ethernet and IEEE 802.3 standard for baseband LANs (local area networks) using a thin coaxial cable (3/16 inch) up to 200 meters long and carrying 10 Mbps (megabits per second) in a bus topology. A network node is connected to the cable by a BNC connector on the adapter card. Also called: Cheapernet, thin Ethernet, ThinNet, ThinWire. See also BNC connector, bus network, coaxial cable, Ethernet (definition 1), IEEE 802.x.

10Base5

n. The Ethernet and IEEE 802.3 standard for baseband LANs (local area networks) using a thick coaxial cable (3/8 inch) up to 500 meters long and carrying 10 Mbps (megabits per second) in a bus topology. A network node is equipped with a transceiver that plugs into a 15-pin AUI connector on the adapter card and taps into the cable. This form of Ethernet is generally used for network backbones. Also called: thick Ethernet, ThickNet, ThickWire. See also coaxial cable, Ethernet (definition 1), IEEE 802.x.

10Base-F

n. The Ethernet standard for baseband LANs (local area networks) using fiber-optic cable carrying 10 Mbps (megabits per second) in a star topology. All nodes are connected to a repeater or to a central concentrator. A node is equipped with a fiber-optic transceiver that plugs into an AUI connector on the adapter card and attaches to the cable with an ST or SMA fiber-optic connector. The 10Base-F standard comprises 10Base-FB for a backbone, 10Base-FL for the link between the central concentrator and a station, and 10Base-FP for a star network. See also Ethernet (definition 1), fiber optics, star network.

10Base-FB

n. See 10Base-F.

10Base-FL

n. See 10Base-F.

10Base-FP

n. See 10Base-F.

10Base-T

n. The Ethernet standard for baseband LANs (local area networks) using twisted-pair cable carrying 10 Mbps (megabits per second) in a star topology. All nodes are connected to a central hub known as a multiport repeater. See also Ethernet (definition 1), star network, twisted-pair cable.

12-hour clock

n. A clock that expresses the time within a 12-hour range, returning to 1:00 after 12:59 AM or PM. Compare 24-hour clock.

1.2M

adj. Short for 1.2-megabyte. Refers to the storage capacity for high-density 5.25-inch floppy disks.

1394

n. See IEEE 1394.

14.4

n. A modem with a maximum data transfer rate of 14.4 Kbps (kilobits per second).

Microsoft Computer Dictionary, Fifth Edition

1.44M

adj. Short for 1.44-megabyte. Refers to the storage capacity for high-density 3.5-inch floppy disks.

16-bit

adj. See 8-bit, 16-bit, 32-bit, 64-bit.

16-bit application

n. An application written to run on a computer with a 16-bit architecture or operating system, such as MS-DOS or Windows 3.x.

16-bit color

adj. Of, pertaining to, or characteristic of a display that can produce 216 (65,536) distinct colors. Compare 24-bit color, 32-bit color.

16-bit machine

n. A computer that works with data in groups of 16 bits at a time. A computer may be considered a 16-bit machine either because its microprocessor operates internally on 16-bit words or because its data bus can transfer 16 bits at a time. The IBM PC/AT and similar models based on the Intel 80286 microprocessor are 16-bit machines in terms of both the word size of the microprocessor and the size of the data bus. The Apple Macintosh Plus and Macintosh SE use a microprocessor with a 32-bit word length (the Motorola 68000), but they have 16-bit data buses and are generally considered 16-bit machines.

16-bit operating system

n. An operating system, now outdated, that can work with 2 bytes, or 16 bits, of information at one time. A 16-bit operating system, such as MS-DOS and Microsoft Windows 3.x, reflects the functionality of a 16-bit processor because the software and the chip must work together so closely. The main advantage of a 16-bit operating system over its earlier 8-bit predecessors (such as CP/M-80) was its ability to address more memory and use a larger (16-bit) bus. Sixteen-bit operating systems have since been eclipsed by 32-bit operating systems—such as the Macintosh operating system, Microsoft Windows NT, and Windows 9x—and by 64-bit operating systems, such as some versions of UNIX. See also 32-bit operating system.

/16 network

n. IP address class B. This class has 16,382 networks available and more than sixty-five thousand hosts available. See also host, IP address classes, network.

1999 problem

n. 1. A variation on the Year 2000 problem in computer systems that have two-digit years in date fields and are used by companies and organizations in which the fiscal year 2000 begins before the end of calendar year 1999. These computer systems may interpret the fiscal year as the year 1900. 2. A potential problem, if not corrected, with date fields in older code that were (sometimes) used to hold values with special meaning. For example, the date 9/9/99 was often used as an expiration date meaning 'keep this information forever' or, worse, 'destroy this document immediately.'

1NF

n. Short for first normal form. See normal form (definition 1).

2000 time problem

n. See Year 2000 problem.

2038 limit

n. A consideration in some PCs that use a signed 32-bit integer to represent date and time. Because such systems determine date and time as the number of seconds elapsed since

Microsoft Computer Dictionary, Fifth Edition

midnight, January 1, 1970, they can handle a maximum of 231 seconds, a number that will be reached at 3:14:07 a.m. on January 19, 2038. When the elapsed seconds exceed that maximum value, the clock will overflow, resulting in an incorrect date and time and, potentially, causing disruptions. Some organizations have defined Year 2000 compliant to mean a system that will have the correct date/time and do proper date handling up through the year 2038, although this is not universal. The extent of the potential problem, of course, is directly related to the number of such system solutions still in operation at the time. See also Year 2000 compliant.

24-bit color

n. RGB color in which the level of each of the three primary colors in a pixel is represented by 8 bits of information. A 24-bit color image can contain over 16 million different colors. Not all computer monitors support 24-bit color, especially older models. Those that do not may use 8-bit color (256 colors) or 16-bit color (65,536 colors). Also called: true color. See also bit depth, pixel, RGB. Compare 16-bit color, 32-bit color.

24-hour clock

n. A clock that expresses the time within a 24-hour range, from 0000 (midnight) to 2359 (one minute before the following midnight). Compare 12-hour clock.

2.4 kernel

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n. Update of the core of the Linux OS, released at the end of 2000. Features in the 2.4 kernel emphasize support for new buses, devices, and controllers; increased USB support; improved Web server performance; and increased symmetrical multiprocessing scalability.

/24 network

n. IP address class A. This class has more than two million networks available and 254 hosts available. See also host, IP address classes, network.

256-bit

adj. Having a data path that is 256 bits wide.

286

n. See 80286.

287

n. See 80287.

28.8

n. A modem with a maximum data transfer rate of 28.8 Kbps (kilobits per second).

2-digit year

n. The capacity for storing only the last two digits of the year in a date. In such systems, the century for the date is not stored. See also two-digit date storage.

2G

n. Acronym for 2nd Generation. The second generation of digital wireless technology, as defined by the International Telecommunications Union (ITU). Second generation technology delivers data transmission at speeds from 9.6 Kbps (kilobits per second) to 19.2 Kbps. Second generation technology provides greater data transmission capabilities and more efficient voice transmission than the analog technology first developed for wireless telecommunications.

2NF

n. Short for second normal form. See normal form (definition 1).

2-nines availability

n. See two-nines availability.

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2.PAK

n. An artificial intelligence programming language.

32-bit

adj. See 8-bit, 16-bit, 32-bit, 64-bit.

32-bit application

n. An application written to run on a computer with a 32-bit architecture or operating system, such as Mac OS or Windows 9x.

32-bit clean

adj. 1. Refers to Macintosh hardware designed to run in 32-bit mode, which can address up to 1 gigabyte of physical RAM under System 7. This includes all present Macintosh computers; some older models used 16-bit addressing. 2. Refers to software written for 32-bit operation.

32-bit color

n. RGB color that is similar to 24-bit color, with 8 additional bits used to allow for faster transfer of an image's color. See also bit depth, RGB. Compare 16-bit color, 24-bit color.

32-bit driver

n. A software subsystem that controls either a hardware device (device driver) or another software subsystem. The 32-bit versions of this software take full advantage of the instruction sets of the 486 and Pentium processors for improved speed. See also driver, instruction set.

32-bit machine

n. A computer that works with data in groups of 32 bits at a time. The Apple Macintosh II and higher models are 32-bit machines, in terms of both the word size of their microprocessors and the size of the data buses, as are computers based on the Intel 80386 and higher-level microprocessors.

32-bit operating system

n. An operating system in which 4 bytes, or 32 bits, can be processed at one time. Windows 95, Windows 98, Windows NT, Linux, and OS/2 are examples. See also instruction set, protected mode.

33.6

n. A modem with a maximum data transfer rate of 33.3 Kbps (kilobits per second).

34010, 34020

n. Graphics coprocessors from Texas Instruments (TI), used mainly in high-end PC graphics boards, which have become a de facto standard for programmable graphics processors. Although both chips use 32-bit registers, the 34010 uses a 16-bit data bus and the 34020 uses a 32-bit bus. The 34020 is compatible with the earlier 34010, and both chips work with TIGA (Texas Instruments Graphical Architecture), a TI standard that allows a single application driver to be used with all boards based on the standard. See also de facto standard, TIGA, video graphics board.

3.5-inch floppy disk

n. Used with the Macintosh and with IBM and compatible microcomputers. A microfloppy disk is a round piece of polyester film coated with ferric oxide and encased in a rigid plastic shell equipped with a sliding metal cover. On the Macintosh, a single-sided 3.5-inch floppy disk can hold 400 kilobytes (KB); a double-sided (standard) disk can hold 800 KB; and a double-sided high-density disk can hold 1.44 megabytes (MB). On IBM and compatible machines, a microfloppy can hold either 720 KB or 1.44 MB of information. See also floppy disk.

Microsoft Computer Dictionary, Fifth Edition

360K

adj. Short for 360-kilobyte. The storage capacity for standard 5.25-inch floppy disks.

.386

n. A file extension for virtual device drivers under Windows 3.1. See also virtual device driver.

386

n. See 80386DX.

386BSD

n. A version of BSD UNIX, different from BSD386 from Berkeley Software Development, Inc. Freely distributable, 386BSD was released in 1992 and is available in two newer versions: NetBSD and FreeBSD. See also BSD UNIX, FreeBSD, NetBSD.

386DX

n. See 80386DX.

386SL

n. See 80386SL.

386SX

n. See 80386SX.

387

n. See 80387.

387SX

n. See 80387SX.

3-D or 3D

adj. 1. Short for three-dimensional. Of, pertaining to, or being an object or image having or appearing to have all three spatial dimensions (length, width, and depth). 2. Having the illusion of depth or varying distances, as in 3-D audio.

3-D array

n. See three-dimensional array.

3-D audio

n. Short for three-dimensional audio. Recorded as stereo sound, 3-D audio enables the listener to feel immersed in the sound and to determine its exact location (up, down, left, right, forward, or backward). This technology is commonly used in video games and virtual-reality systems, as well as in some Internet applications. Also called: 3-D sound, binaural sound.

3-D graphic

n. Any graphical image that depicts one or more objects in three dimensions—height, width, and depth. A 3-D graphic is rendered on a two-dimensional medium; the third dimension, depth, is indicated by means of perspective and by techniques such as shading or gradient use of color.

3-D metafile

n. A device-independent file for storing a 3-D display. See also metafile.

3DMF

n. See QuickDraw 3-D.

3-D model

n. See three-dimensional model.

Microsoft Computer Dictionary, Fifth Edition

3-D sound

n. See 3-D audio.

3-finger salute

n. See three-finger salute.

3G

n. Acronym for 3rd Generation. The third generation of digital wireless technology, as defined by the International Telecommunications Union (ITU). Third generation technology is expected to deliver data transmission speeds between 144 Kbps (kilobits per second) and 2 Mbps (megabits per second), compared to the 9.6 Kbps to 19.2 Kbps offered by second generation technology. Western Europe and Japan lead the world in adoption of 3G technology and services.

3GL

n. Short for third-generation language. A high-level programming language that was designed to run on the third generation of computer processors, built on integrated circuit technology roughly from 1965 to 1970. C, FORTRAN, Basic, and Pascal are examples of third-generation languages still in use today. See also high-level language, integrated circuit. Compare 4GL, low-level language.

3NF

n. Short for third normal form. See normal form (definition 1).

3-nines availability

n. See three-nines availability.

3Station

n. A diskless workstation developed by Bob Metcalfe at 3Com Corporation. See also diskless workstation.

400

n. HTTP status code—Bad Request. A Hypertext Transfer Protocol message from an HTTP server indicating that a client request cannot be completed because the syntax of the request is incorrect. See also HTTP server (definition 1), HTTP status codes.

401

n. HTTP status code—Unauthorized. A Hypertext Transfer Protocol message from an HTTP server indicating that a client request cannot be completed because the transaction requires an Authorization header, which was not supplied. See also HTTP server (definition 1), HTTP status codes.

402

n. HTTP status code—Payment Required. A Hypertext Transfer Protocol message from an HTTP server indicating that a client request cannot be completed because the transaction requires a payment, and no ChargeTo header was supplied. See also HTTP server (definition 1), HTTP status codes.

403

n. HTTP status code—Forbidden. A Hypertext Transfer Protocol message from an HTTP server indicating that a client request cannot be completed because access is restricted. See also HTTP server (definition 1), HTTP status codes.

404

n. HTTP status code—Not Found. A Hypertext Transfer Protocol message from an HTTP server indicating that a client request cannot be completed because the server is unable to find an

Microsoft Computer Dictionary, Fifth Edition

address that matches the URL requested. See also HTTP server (definition 1), HTTP status codes, URL.

486

n. See i486DX.

486DX

n. See i486DX.

486SL

n. See i486SL.

486SX

n. See i486SX.

4-digit year

n. The capacity for storing all four digits of the year in a date in hardware or firmware products.

4GL

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n. Short for fourth-generation language. A programming language designed to mimic human language. The designation is often used to specify languages used with relational databases and is intended to imply that such languages are a step up from standard high-level programming languages such as C, Pascal, and COBOL. See also application development language, highlevel language. Compare 3GL, assembly language.

4GL architecture

n. See two-tier client/server.

4mm tape

n. See digital audio tape.

4NF

n. Short for fourth normal form. See normal form (definition 1).

4-nines availability

n. See four-nines availability.

5.25-inch floppy disk

n. Used with the Macintosh and with IBM and compatible microcomputers. A microfloppy disk is a round piece of polyester film coated with ferric oxide and encased in a rigid plastic shell equipped with a sliding metal cover. A floppy disk 5.25 inches in diameter is encased in a flexible plastic jacket and has a large hole in the center, which fits around a spindle in the disk drive; such a disk can hold from a few hundred thousand to over one million bytes of data. See floppy disk.

56flex

n. See K56flex.

56K1

adj. Having 56 kilobits per second (Kbps) available for traffic on a communications circuit. One voice channel can carry up to 64 Kbps (called a T0 carrier); 8 Kbps are used for signaling, leaving 56 Kbps available for traffic. See also T-carrier.

56K2

n. See 56-Kbps modem.

56-Kbps modem

Microsoft Computer Dictionary, Fifth Edition

n. An asymmetric modem that operates over POTS (Plain Old Telephone Service) to deliver data downstream at 56 Kbps, with upstream speeds of 28.8 and 33.6 Kbps. Earlier, slower modems invoke a two-conversion transmission process: digital data from a computer is converted into analog form for transmission over the telephone wire and is then reconverted to digital data by the receiving modem. In contrast, 56-Kbps modems achieve faster speeds by converting analog data to digital data only once, typically at the telephone company's switching office near the beginning of the transmission's journey. Designed to improve download times for Internet users, 56-Kbps modems rely on a public phone network that allows for a single conversion and on the availability of a digital connection, such as ISDN or T1, at the ISP (Internet Service Provider) location that provides the actual connection to the Internet. See also analog data, digital data transmission, modem, POTS.

586

n. The unofficial name used by industry analysts and by the computer trade press to describe Intel's successor to the i486 microprocessor prior to its release. In the interest of using a name that could be trademarked, however, Intel decided to name the microprocessor Pentium. See also Pentium.

5NF

n. Short for fifth normal form. See normal form (definition 1).

5-nines availability

n. See five-nines availability.

5x86

n. Cyrix Corporation's clone of the Intel Pentium CPU. See also 586, 6x86, central processing unit, clone, Pentium.

601

n. See PowerPC 601.

603

n. See PowerPC 603.

604

n. See PowerPC 604.

64-bit

adj. Of, pertaining to, or descriptive of the amount of data—64 bits, or 8 bytes—that certain computer systems or programs can process at one time.

64-bit machine

n. A computer that works with data in groups of 64 bits at a time. A computer may be considered a 64-bit machine either because its CPU operates internally on 64-bit words or because its data bus can transfer 64 bits at a time. A 64-bit CPU thus has a word size of 64 bits, or 8 bytes; a 64bit data bus has 64 data lines, so it ferries information through the system in sets of 64 bits at a time. Examples of 64-bit architecture include the Alpha AXP from Digital Equipment Corporation, the Ultra workstation from Sun Microsystems, Inc., and the PowerPC 620 from Motorola and IBM.

64-bit operating system

n. An operating system in which 8 bytes, or 64 bits, can be processed at one time. For Microsoft Windows, the 64-bit operating systems are Windows XP 64-Bit Edition, the 64-bit versions of Windows .NET Enterprise Server, and Windows .NET Datacenter Server. The IBM AS/400 uses a 64-bit operating system.

6502

Microsoft Computer Dictionary, Fifth Edition

n. The 8-bit microprocessor, developed by Rockwell International, that was used in the Apple II and Commodore 64 microcomputers.

65816

n. A 16-bit microprocessor from Western Digital Design used in the Apple IIGS. It can emulate the 6502, providing compatibility with all old Apple II software. See also 6502.

6800

n. An 8-bit microprocessor developed by Motorola in the early 1970s. It failed to gain wide acceptance.

68000

n. The original microprocessor in the 680x0 family from Motorola, introduced in 1979 and used in the first Apple Macintosh computers as well as the Apple LaserWriter IISC and Hewlett-Packard's LaserJet printers. The 68000 has 32-bit internal registers but transfers data over a 16-bit data bus. With 24-bit physical addressing, the 68000 can address 16 megabytes of memory—16 times as much memory as does the Intel 8088 found in the IBM PC. In addition, the 68000's architecture, in which addressing is linear (as opposed to the 8088's segmented addressing) and in which all address registers work the same way and all data registers work the same way, makes programming more straightforward. See also linear addressing architecture, segmented addressing architecture.

68020

n. A microprocessor in the 680x0 family from Motorola, introduced in 1984. This chip has 32-bit addressing and a 32-bit data bus and is available in speeds from 16 MHz to 33 MHz. The 68020 is found in the original Macintosh II and the LaserWriter IINT from Apple.

68030

n. A microprocessor in the 680x0 microprocessor family from Motorola, introduced in 1987. This chip has 32-bit addressing and a 32-bit data bus and is available in speeds from 20 MHz to 50 MHz. The 68030 has built-in paged memory management, precluding the need for supplemental chips to provide that function.

68040

n. A microprocessor in the 680x0 family from Motorola, introduced in 1990, with 32-bit addressing and a 32-bit data bus. The 68040 runs at 25 MHz and includes a built-in floating-point unit and memory management units, including independent 4-KB instruction and data caches, which eliminate the need for supplemental chips to provide these functions. In addition, the 68040 is capable of parallel instruction execution by means of multiple independent instruction pipelines, multiple internal buses, and separate caches for both data and instructions.

68060

n. The latest and fastest of the 680x0 microprocessors from Motorola, introduced in 1995. This chip has 32-bit addressing and a 32-bit data bus and is available in speeds from 50 MHz to 75 MHz. There was no 68050. The 68060 is probably the last in the 680x0 series from Motorola.

6845

n. A programmable video controller from Motorola used in IBM's Monochrome Display Adapter (MDA) and Color/Graphics Adapter (CGA). The 6845 became such an integral part of the IBM PC and compatibles that later generations of video adapters, such as EGA and VGA, continue to support the operations of the 6845. See also CGA, EGA, MDA, VGA.

68881

n. The floating-point coprocessor from Motorola for use with the 68000 and the 68020. The 68881 provides instructions for high-performance floating-point arithmetic, a set of floating-point data registers, and 22 built-in constants including p and powers of 10. The 68881 conforms to the

Microsoft Computer Dictionary, Fifth Edition

ANSI/IEEE 754-1985 standard for binary floating-point arithmetic. The 68881 can produce a dramatic improvement in system performance when software takes advantage of it. See also floating-point processor.

68K

n. See 68000.

6x86

n. An 8086-compatible microprocessor designed by Cyrix Corporation. It is socket-compatible with some Pentium microprocessors from Intel and can be used in their place. See also 8086, microprocessor, Pentium.

740

n. See PowerPC 740.

750

n. See PowerPC 750.

7-bit ASCII

n. A 7-bit ASCII character set used for standard UNIX mail messages. The leftover eighth bit is a parity bit used for error correction. See also ASCII, parity bit.

7-track

n. A tape storage scheme that places data on seven separate, parallel tracks on 1/2-inch reel-to- reel magnetic tape. This is an old recording format used with computers that transfer data 6 bits at a time. Data is recorded as 6 data bits and 1 parity bit. Some personal computers now use the 9-track tape storage scheme. See also 9-track.

80286

n. A 16-bit microprocessor from Intel, introduced in 1982 and included in the IBM PC/AT and compatible computers in 1984. The 80286 has 16-bit registers, transfers information over the data bus 16 bits at a time, and uses 24 bits to address memory locations. The 80286 operates in two modes: real mode, which is compatible with the 8086 and supports MS-DOS, and protected mode, which enables the CPU to access 16 megabytes of memory and protects the operating system from incorrect memory accesses by ill-behaved applications, which could crash a system in real mode. Also called: 286. See also protected mode, real mode.

80287

n. A floating-point coprocessor from Intel for use with the 80286 family of microprocessors. Available in speeds from 6 MHz to 12 MHz, the 80287 offers the same mathematical capabilities that the 8087 coprocessor provides to an 8086-based system. Because the 80287 conforms to the 80286 memory management and protection schemes, it can be used in both the real and protected modes of the 80286. Also, if the computer manufacturer implements support for it in the motherboard design, the 80287 can be used in a system with an 80386 microprocessor. See also floating-point processor.

802.x standards

n. See IEEE 802.x.

802.11 standards

n. See IEEE 802.11.

80386

n. See 80386DX.

80386DX

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