TITLE
    Twentieth Anniversary Macintosh: Technical Specifications
Article ID:
Created:
Modified: 		30182
9/25/97
9/16/98
TOPIC

    This article provides the technical specifications for the Twentieth Anniversary Macintosh.

DISCUSSION

    Main U nit

    Processor
    A PowerPC 603e processor with the following features:
    • Processor speed: 250 megahertz (MHz)
    • Built-in floating point unit (FPU)
    • 50 MHz system bus
    • 32 kilobytes (K) internal cache (16K data, 16K instructions)

    Memory
    • 32 megabytes (MB) of dynamic random-access memory (DRAM) installed in either a single 32 MB Dual Inline Memory Module (DIMM) or two 16 MB DIMMs.
    • 2 MB of built-in video memory using synchronous graphic RAM (SGRAM)
    • 4 MB of read-only memory (ROM)
    • 50 MHz High Performance Cache Module (256K level 2 cache)

    Notes:
    • Each DIMM slot can accommodate a DIMM of up to 64 MB, for a maximum of 128 MB.
    • DRAM DIMMs should be 64-bit wide, 5 V, 168-pin extended data output (EDO) or fast-paged mode DIMMs, with 60-nanosecond (ns) RAM access time or faster and a 2K refresh count.
    • The Single Inline Memory Modules (SIMMs) from older Macintosh computers are not compatible with your computer and cannot be used. DIMMs that require a 4K refresh count and 3.3 V DIMMs cannot be used.


    Internal storage devices
    The following storage devices were installed in your computer at the factory:
    • Apple SuperDrive 1.4 MB high-density floppy disk drive
    • 2 gigabyte (GB) Apple ATA (Advanced Technology Attachment) hard disk drive, also known as an Enhanced Integrated Device Electronics (IDE) hard disk drive.
    • Custom front-loading CD-ROM drive

    CD-ROM drive specifications

    Disc diameter:
    • 120 millimeters (mm) (4.7 inches)
    • 80 mm (3.2 inches)

    Average access time:
    • Audio: 380 milliseconds (ms) for playing audio CDs
    • Data: 200 ms

    Data capacity:
    • 656 megabytes (MB), Mode 1
    • 748 MB, Mode 2

    Maximum playing time:
    • 74 minutes, 42 seconds

    Playback formats supported:
    • Audio CD
    • CD-ROM (Modes 1 and 2)
    • CD-ROM XA (Mode 2, Forms 1 and 2)
    • CD-I (Mode 2, Forms 1 and 2)
    • CD-I (Ready)
    • CD-I (Bridge)
    • Photo CD (Single session and multisession)
    • Video CD
    • CD-WO (write once) playback

    Laser:
    Type: Semiconductor GaAlAs laser
    Wavelength: 790 ±25 nanometers
    Output power: 0.2 to 0.6 milliwatts
    Beam divergence: 55°


    Video System

    Flat panel display:
    • 12.1-inch diagonal, 800 x 600 active matrix with backlighting
    • Color liquid crystal
    • 256 or thousands of colors
    • Color depth: 6 bits each R, G, B

    Video and graphics modes:
    The computer has the following video and graphic capabilities built into the logic board:
    • ATI 3D RAGE II 64-bit graphics and multimedia accelerator chip
    • 2 MB synchronous graphic RAM (SGRAM)
    • Hardware acceleration of 2-dimensional (2D) QuickDraw graphics and video‹accelerates tasks such as scrolling, text and graphic display, and screen redraw
    • Hardware acceleration of video for full-screen, full-motion, TV-quality playback of QuickTime movies‹accelerates and improves full-screen display of most QuickTime movies and enhances video capture when used with an optional video input card.
    • Hardware acceleration of 3-dimensional (3D) QuickDraw 3D rendering‹accelerates QuickDraw 3D rendering up to 6 times faster than software-only rendering; provides real-time 3D shaded object manipulation, animation, and virtual world navigation; and enhances the realism of 3D interactive titles and games

    Hardware support for 3D features, including the following:
    • 16-bit Z-buffer for hidden surface removal
    • Six perspectively correct texture mapping functions
    • Video textures and texture lighting
    • Flat and Gouraud shading
    • Alpha blending, transparency, and fog effects
    • Support for QuickDraw 3D Rendering Acceleration Virtual Engine (RAVE)

    Graphics modes supported:
    Your computer can display the graphics modes listed in the following table.

    Video 2D 3D
    Color Bit Resolution
    Vertical Depth (1)
    Scan (Hz)
    Input Support?
    Accel. Support?
    Accel. Support?
    640 x 480
    8
    60
    Yes
    Yes
    No
    16
    60
    Yes
    Yes
    Yes
    800 x 600
    8
    60
    Yes
    Yes
    No
    16
    60
    Yes
    Yes
    (2)
    (1) A color depth of 16 bits can display 32,768 colors; a color depth of 8 bits can display 256 colors.
    (2) Depends on the application window size.

    Video input:
    The built-in video input card lets you view and record video from a video camera, VCR, or other video input equipment. The built-in Apple TV/FM Radio System or Apple TV System lets you record video from broadcast or cable TV.
    • Input format: S-video; composite video through composite video to S-video adapter cable
    • Transmission format: industry standard NTSC/PAL/SECAM
    • Polarity: sync negative or sync positive depending on video mode
    • Level: 0.6 volts peak-to-peak ( Vpp) minimum to 1.5 Vpp maximum (³S² chroma level 1.4 Vpp maximum)
    • S-video impedance: 75 ohms (‡)
    • DC offset: ±0.1 volts ( V) maximum

    Sound:
    • 16-bit stereo input and output supporting sample rates of 11.025, 22.05, and 44.1 kilohertz (kHz)
    • Built-in Bose sound system including Bose bass unit
    • Front panel push-button control for volume level and muting
    • Front headphone jack
    • Built-in omnidirectional electret type microphone
    • Sound input and output ports on back of computer

    Input level to sound input port
    The information in this section applies to the sound input port in the lower rear area of the computer's back panel, not the video/audio input port next ot the S-video port in the area covered by the port cover plate. The sound input port (marked with the microphone icon) has two external sound input modes: low level and high level. To select low or high level, open the Monitors & Sound control panel, click the sound button, and choose External Microphone (for low level) and Line Level Input (for high level) in the Sound Output pop-up menu.

    Recording levels for various input sources:
    Monitors and Sound Input source selection
    Plug Type
    Level
    External microphone 3-cond
    3-cond
    13 mV rms
    External microphone 4-cond
    4-cond
    250 mV rms
    Line level input 3-cond
    3-cond
    250 mV rms

    Sound input port input impedance:
    • 3.5 kilohms nominal, each channel

    Input level to video audio input port:
    The information in this section applies to the video audio input port next to the S-video port in the area covered by the port cover plate. The video audio input port (marked with the microphone icon, next to the S-video port marked with the video camera icon) has one external sound input mode.

    To select the video audio input port for sound input, open the Monitors & Sound control panel, click the Sound button, and choose TV/CD/Video in the Sound Output pop-up menu. Then open Apple Video Player, make sure that the Controls window is open, and click the S-Video button in the Video Source section. Set the volume slider in the S-video window to maximum volume.
    • Video audio input connector line level for full-scale output level, with the S-video window's volume slider set at maximum in Apple Video Player: 0.1 Vrms
    • Video audio input connector line level for full-scale recording level, with the S-video window¹s volume slider set at maximum in Apple Video Player: 90 mVrms
    • Video audio input connector input impedance: 10 k nominal, each channel

    Voltage and impedance for sound output ports:
    • Front sound output connector output impedance: 32 ‡ nominal, each channel
    • Front sound output full-scale open circuit output voltage: 1 Vrms
    • Rear sound output connector output impedance: 32 ‡ nominal, each channel
    • Rear sound output full-scale open circuit output voltage: 1 Vrms

    Signal-to-noise ratio (SNR) and frequency response:
    • SNR: 75 decibels (dB) minimum, 80 dB typical (A-weighted, 2 Vpp output, 1 kHz, digital record and playback, sound input port to sound output port)
    • Frequency response: 20 Hz­18 kHz (­3 dB relative to 1 kHz under the same conditions as the SNR measurement)

    Clock/calendar
    • CMOS custom circuitry with long-life battery
    Warning: If the clock begins to keep time inaccurately, have an Apple-authorized dealer or service provider replace the battery. The service provider will dispose of the battery according to the local environmental guidelines. Do not attempt to replace the clock battery yourself.

    Keyboard :
    Twentieth Anniversary Macintosh custom keyboard
    • Two ADB connectors; one for the trackpad and one for adding a second device if desired

    Trackpad:
    • Solid-state keyboard-mounted trackpad (ADB device); can be removed and repositioned

    Interfaces:
    • Apple Desktop Bus (ADB) port supporting up to three ADB input devices (such as a trackball, keyboard, or mouse) daisy-chained through a serial bus; additional ADB port on back of keyboard
    • One internal expansion slot supporting 6.88-inch 15-watt PCI (peripheral component interconnect) expansion cards. Install only expansion cards that come with Macintosh drivers and are compliant with the PCI 2.0 standard. NuBus cards cannot be used in this expansion slot.
    • One internal expansion slot (Comm slot II), supporting communication cards, such as an internal modem or Ethernet card
    • One internal video expansion slot supporting a video input card using the NTSC, PAL, and SECAM formats (The video input card is already installed in this slot.)
    • One TV tuner card that allows you to connect your computer to an external TV antenna or cable TV service and FM radio antenna (The Apple TV/FM Radio System card is already installed.)
    • Two RS-232/RS-422 serial GeoPort-compatible ports for printers, modems, LocalTalk network, or other serial devices
    • One external standard SCSI port for storage devices, scanners, printers, and other SCSI devices; supports up to six external devices
    • One 3.5-mm sound output port for line-level devices, such as powered loudspeakers, on the back of the computer
    • One 3.5-mm headphone jack on the front of the computer
    • One 3.5-mm sound input port for stereo sound input
    • One 3.5-mm sound input port for stereo sound related to video recording The two sound input ports support a standard stereo (miniplug-to-RCA) cable adapter for connecting stereo equipment to your computer. They do not support the Apple Omni microphone (the round microphone shipped with some earlier models of Macintosh) or the attenuated RCA adapter provided with some models of Macintosh.
    • Note: Equipment attached to the sound input ports must generate line level output.
    • S-video input port for VCR, camcorder, or other video input device; adapter for composite video input devices; supports NTSC, PAL, and SECAM video standards.
    • F-type connector for TV cable or antenna
    • Connector for FM antenna
    • Front panel buttons for volume and brightness
    • Support for infrared remote control of audio CDs, and for muting sound, setting volume, changing TV or FM channels, adjusting the video window, and turning the computer on and off.

    Environment:
    • Operating temperature: 10° C to 35° C (50° F to 95° F)
    • Storage temperature: ­40° C to 47° C (­40° F to 116.6° F)
    • Relative humidity: 5% to 95% noncondensing
    • Altitude: Works below 3048 m (10,000 ft.)

    Size and weight:
    Unit
    Weight
    Height
    Width
    Depth
    Main unit
    6.8 kg
    14.9 lbs.
    43.8 cm
    17.25 in.
    41.9 cm
    16.5 in.
    25.4 cm
    10.0 in.
    Bass unit
    4.8 kg
    10.5 lbs.
    27 cm
    10.63 in.
    21.1 cm
    8.31 in.
    29.8 cm
    11.75 in.
    Keyboard
    .84 kg
    1.86 lbs.
    2.5 cm
    1 in.
    29.2 cm
    11.5 in.
    20.7 cm
    8.13 in.

    Power

    AC line input:
    Line voltage: 90­130 volts ( V) or 180­264 V alternating current (AC), RMS single phase. The computer's voltage is configured manually using a control on the bass unit; this control is pre-set at the factory.
    Frequency: 47­63 Hz

    Power consumption:
    140 watts ( W) maximum continuous input power. Typical AC power is 47 W for a 250 MHz computer with a 603e processor, 2 gigabyte (GB) hard disk, 28.8K bits per second (bps) modem, High Performance L2 Module, and a CD-ROM drive installed.

    DC power:
    Maximum continuous output: 70 watts ( W)
    Voltage (V) Maximum current (A)
    (1)
    +5 8.5 (2)
    +5 (trickle) 0.1
    +3.3 5 (2)
    +12 2.3
    ­12 0.25
    (1) Total power output cannot exceed 98 W.
    (2) Not more than 10.7 A total combined current on +5 V and +3.3 V outputs.

    Sleep mode:
    • The AC power usage for a computer without PCI cards installed is less than 30 W in sleep mode.

    CD-ROM drive:
    The following table shows typical power consumption for the internal CD-ROM drive.

    Power consumption (typical)
    +5 V DC 350 milliamperes (mA)
    +12 V DC 500 mA

    Power requirements for devices you can connect:
    • Apple Desktop Bus (ADB)
    • Trackpad draws up to 10 mA
    • Keyboard draws 25­80 mA (varies with keyboard model used)
    Maximum current available for all ADB devices and all serial devices: 500 mA Note: The ADB port can support up to three daisy-chained ADB devices.

    Audio and telecommunications devices:
    The following table shows power allowances for external devices connected to input ports.
    Device
    Voltage
    Current
    Power
    Microphone
    +5 V
    1 mA
    5 mW
    GeoPort Telecom Adapter& ADB devices
    +5 V
    500 mA
    2.5 W
    S-video input connector
    +12 V
    250 mA
    3 W

    Expansion cards:
    Your computer can accommodate only 6.88-inch PCI expansion cards. If you add an expansion card to your computer, make sure the momponent's power requirements do not exceed the maximum power allowances allocated to it by the computer.

    The computer can accommodate only 6.88-PCI expansion cards. If you add an expansion card to your computer, make sure the power requirements do not exceed the maximum power allowances allocated to it by the computer in the following table:

    Device Voltage Current Power:
    Device
    Voltage
    Current
    Power
    PCI expansion cards (15 watts)*
    +3.3 V
    +5 V
    ­12 V
    2 A
    3 A
    500 mA
    6.6 W
    15 W
    6 W
    Communication expansion card Ý
    +5 V
    +12 V
    500 mA
    100 mA
    2.5 W
    1.2 W
    * Each PCI expansion card should not consume more than 15 watts of power total.

    Ý The communication card should not consume more than 2.5 watts of power total.

    Express Modem specifications :

    AT command set:
    • Extended Hayes AT command set

    Data Communications Standards:
    • 33600, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 2400, 4800 bps: ITU V.34
    • 14400, 12000, 9600, 7200, 4800 bps: ITU V.32 bis
    • 9600, 4800 bps: ITU V.32
    • 2400 bps: ITU V.22 bis
    • 1200 bps: Bell 212A, ITU V.22
    • 1200/75 bps: ITU V.23
    • 75/1200 bps: ITU V.23
    • 300 bps: ITU V.21
    • 300 bps: Bell 103

    Group 3 Fax Communication Standards:
    • 2400, 4800 bps: ITU V.27 ter
    • 7200, 9600 bps: ITU V.29
    • 12000, 14400 bps: ITU V.17

    Error control:
    • ITU V.42
    • MNP Classes 2­4
    • Fax Error Correction Mode (ECM): ITU T.30

    Data compression:
    • ITU V.42 bis (up to 4:1 compression)
    • MNP Class 5 (up to 2:1 compression)

    Dialing capability:
    • Tone/pulse dialing
    • Auto or manual dialing and answering

    Data transmission and format:
    • Full or half duplex operation
    • Asynchronous or framed modes

    Character formats:
    • 5, 6, 7, 8, data bits
    • 1 or 2 stop bits
    • Odd, even, or no parity

    Memory requirements:
    • The Express Modem software uses approximately 600K of system memory when the modem is turned on.


Document Information
Product Area: Computers
Category: Power Macintosh
Sub Category: Twentieth Anniversary Macintosh
Keywords: specsht

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