|
|
68000 ==>
Motorola 68000
<processor> (MC68000) The first member of Motorola, Inc.'s
family of 16- and 32-bit microprocessors. The successor to
the Motorola 6809 and followed by the Motorola 68010.
The 68000 has 32-bit registers but only a 16-bit ALU and
external data bus. It has 24-bit addressing and a linear
address space, with none of the evil segment registers of
Intel's contemporary processors that make programming them
unpleasant. That means that a single directly accessed
array or structure can be larger than 64KB in size.
Addresses are computed as 32 bit, but the top 8 bits are cut
to fit the address bus into a 64-pin package (address and data
share a bus in the 40 pin packages of the 8086 and Zilog
Z8000).
The 68000 has sixteen 32-bit registers, split into data and
address registers. One address register is reserved for the
Stack Pointer. Any register, of either type, can be used
for any function except direct addressing. Only address
registers can be used as the source of an address, but data
registers can provide the offset from an address.
Like the Zilog Z8000, the 68000 features a supervisor and
user mode, each with its own Stack Pointer. The Zilog
Z8000 and 68000 are similar in capabilities, but the 68000 is
32 bits internally, making it faster and eliminating forced
segmentations.
Like many other CPUs of its generation, it can fetch the next
instruction during execution (2 stage pipeline).
The 68000 was used in many workstations, notably early
Sun-2 machines, and personal computers, notably Apple
Computer's first Macintoshes and the Amiga. It was also
used in most of Sega's early arcade machines, and in the
Genesis/Megadrive consoles.
Variants of the 68000 include the 68HC000 (a low-power HCMOS
implementation) and the 68008 (an eight-bit data bus version
used in the Sinclair QL).
["The 68000: Principles and Programming", Leo Scanlon, 1981].
(2003-07-11)
Try this search on OneLook / Google
Nearby terms:
Motorola « Motorola 14500B « Motorola 6800 « Motorola 68000 » Motorola 6801 » Motorola 68010 » Motorola 68020
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
Artec 16x DVD-ROM IDE Drive (Beige)Artec 16x DVD-ROM IDE Drive (Beige) ** Artec 16x DVD-ROM IDE Drive **This Artec DVD-ROM drive provides access to all types ofmedia including DVD movies! It's capable of reading DVD data at 16x speed and CD-ROM data at up to 48x. Turn your PC into a multimedia center with this Artec DVD-ROM IDE drive! General Features:- Beige bezel- 16x maximum read speed (DVD)- 48x maximum read speed (CD)- IDE interfaceFront Panel Features:- Headphone jack- Volume control dial- Play/Next button- Stop/Eject button- Emergency eject holeRear Panel Features:- Digital audio connector- Analog audio connector- Device jumpers- IDE interface- 4-pin power connectorRegulatory Approvals:- FCC- CE- UL- C-Tick- TUVNotes:- Drive only- Model: DHI-G48 Compatibility/Requirements/Disclosures:** Requirements *** IDE controller* IDE cable* Available 5.25-inch drive bay* Available 4-pin power connector* DVD software (hardware or software) More ...
Memorex 52x32x52 CDRW External USB 2.0 DriveMemorex 52x32x52 CDRW External USB 2.0 Drive ** Memorex 52x32x52 CDRW External USB 2.0 Drive **The Memorex Ultra Speed CD Recorder is the best way to create, archive, duplicate and view any information. You can hold up to 700MB of data on a standard 80-minute disc. This external drive has a max. read speed of 52X, a max. write rate of up to 52X and a max. rewriting speed of 32X. The average access time is 80ms. The drive uses Smart-Burn Technology, automatically checking media quality and setting the burning speed to ensure successful writing. This drive comes with Nero software to get you started. General Features:- 52x maximum write speed (CD-R)- 32x maximum write speed (CD-RW)- 52x maximum read speed (CD)- 52x maximum read speed (CD-R)- 52x maximum read speed (Video CD)- 52x maximum read speed (CD-RW)- 80 ms average access time- USB 2.0 interface- Sturdy plastic enclosure keeps drive safeSupported Read Formats:- CD-ROM- CD-ROM/XA- CD-R- CD-RW- CD-DA- Video CD- Photo CD- CD-ExtraFront Bezel Features:- Headphone jack with volume control dial- LED activity indicator- Eject/load button- Emergency eject holeRear Panel Features:- On/off switch- USB interface- Audio out jack- DC power in jack.Regulatory Approvals:- FCC- CE- UL- TUV-GSPackage Includes:- Memorex 52x32x52 External USB 2.0 CDRW drive- Power adapter (100-240 V ~ 50/60 Hz)- Power cord- USB cableNotes:- Model: MRX523252AJEL-1- P/N: 32023234 Compatibility/Requirements/Disclosures: ** Requirements *** Windows 98SE/ME/2000/XP* Available USB port* Available power outlet More ...
HP LaserJet 4200 Laser Printer w Used TonerHP LaserJet 4200 Laser Printer w Used Toner ** HP LaserJet 4200 Laser Printer w Used Toner **The HP LaserJet 4200 printer is the new standard for workgroup printing. This fast versatile 35 ppm workgroup laser printer offers high performance and crisp, clear printing at 1200 dpi at full speed. With numerous paper handling accessories, this printer can be customized for any office. The HP LaserJet 4200 printer provides office workgroups a simple, worry-free means to get their business documents on a page.General Features:- Monochrome laser printer print speed: 35 ppm- Processor: 300 MHz- Duty cycle: 150,000 pages per month- First page out (letter size): less than 10 sec- Print resolution: 1200 x 1200 dpi at full speed- Memory: 48 MB expandable to 416 MB through three industry standard DIMM slots- Connectivity: IEEE 1284-compliant bidirectional parallel, 2 open EIO slotsPaper Handling:- 100-sheet multi-purpose tray - 500-sheet input tray - Straight through paper path - Paper capacity can be expanded to 2,600 sheets maximum with optional 500-sheet and 1,500-sheet input traysMedia Types: - paper (plain, letterhead, prepunched, bond, color, preprinted, recycled), transparencies, labels, envelopes, card stock, user definedCompatible Network Operating Systems: - Microsoft Windows 95, 98, Me, NT 4.0, 2000, XP, Novell NetWare 3.2, 4.2, 5.x, 6; Apple Mac OS 8.6 and later; RedHat Linux 6.x and later; SUSE Linux 6.x and later; HP-UX 10.20, 11.x; Solaris 2.5x, 2.6, 7, 8 (SPARC systems only); IBM AIX 3.2.5 and later, MPE-iXNotes:- THERE IS NO WARRANTY ON THE TONER More ...
USB to Dual PS/2 Adapter for Mouse and Keyboard!USB to Dual PS/2 Adapter for Mouse and Keyboard! ** USB to dual PS/2 adapter for keyboard and mouse **If your customers have an extra PS/2 keyboard and/or mouse, and want to use them with a computer that has only USBports, here is the answer. This adapter supports PS/2keyboards and mice, yet uses only one USB port! Ordertoday!General Features- Compliant with USB 1.0 and 1.1- Compliant with USB Human Interface Device (HID) Ver. 1.1- Power consumption (Idle): 25mA- Unit weight: 53g- Dimensions: 32.0 x 2.1 x 1.4 cm- USB Bus powered- Supports two PS/2 keyboards or two PS/2 mice- Supports standard Windows Multimedia Keys (Windows versionmust support them as well.)Package includes adapter ONLY Compatibility/Requirements/Disclosures:** Requirements *** PC or Mac with USB port* Win 98/98SE/ME/2000/XP OR Mac OS 9.x/X ORLinux kernel 2.4.x or newer, with USB support More ...
IQ TestIQ Test Point-and-click your way to potential, with the Snap! IQ Test on CD-ROM. Read leisurelythrough the multiple-choice questions designed to determine your Intelligence Quotient by evaluating your aptitudes in linear, verbal, mathematical, and spatial relationships. Windows 95/98/ME/2000/XP More ...
Mini Tripod (Black) - 2 for $6.99Mini Tripod (Black) - 2 for $6.99 ** Mini Tripod (Black) - 2 for $6.99 **Digital photographers will love this mini tripod. This tripod is only 4-inches tall so it is perfect for close-ups!The adjustable legs and standard camera mount make it easyto get the perfect shot.General Features:- Black design- Standard tripod mount- Less than 4-inches tall- Silver finish- Ideal for macro use with digital cameras- Easy to use- Adjustable camera mount angle- Adjustable camera legsNotes:- The tripod will not support cameras with long lenses Compatibility/Requirements/Disclosures:** Requirements *** Camera with standard tripod mount More ...
|
