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K Service Source

Twentieth Anniversary
K Service Source

Twentieth Anniversary Macintosh
Basics Overview - 1

Because the Twentieth
Anniversary Macintosh is a
limited production product,
not everyone will have an
opportunity to personally
view this computer. Some
basic overview information
and the Twentieth Anniver-
sary Macintosh User
Manual have been included
here to familiarize all
Service Source customers
with the basic features and
operation of this product.

Due to the unique nature of
Basics Overview - 2

this computer, any service requiring removal of enclosure
screws must be handled by a centralized repair center;
therefore, detailed repair instructions will not be
distributed via Service Source CD.

Details on the Twentieth Anniversary Macintosh service
strategy will be documented on the next Service Source CD
and through a Service Program notice.
Basics Rear Panel Connectors - 3

Rear Panel
The graphic at left shows the
connectors on the rear
panel of the Twentieth
Anniversary Macintosh
Basics Back Panel View - 4

Back Panel View
There are two back panels
that can be installed on the
Twentieth Anniversary
Macintosh main unit: the
standard back panel, and the
expansion hatch that is used
when optional cards are
installed in the unit.

The graphic at left shows the
standard back panel. The
graphic on the following
page shows the expansion
hatch installed on the main
Basics - 5
Basics Connecting the Base Unit to the Main Unit - 6

Connecting the
Base Unit to the
Main Unit
When connecting the base
unit to the main unit, be
sure to align the bumps on
the cable connectors as
shown and then twist the
metal ring to secure the
Basics Sound System - 7

Sound System
The Twentieth Anniversary
Macintosh features a custom
Acoustimass sound system
by Bose with integrated
stereo speakers (built into
the main unit) and
subwoofer (built into the
Base unit pictured on the
K Service Source

Twentieth Anniversary Macintosh
Specifications Processor - 1


CPU 250 MHz PowerPC 603e processor
Built-in floating point unit (FPU)
32K of on-chip cache memory
Specifications Memory - 2


DRAM 32 MB DRAM, installed as either a single 32 MB DIMM or two 16
Each DIMM socket can accommodate a DIMM up to 64 MB, for a
maximum of 128 MB. Requires 64-bit wide, 5 V, 168-pin
EDO or FPM, 60 ns or faster DIMMs with 2K refresh rate.

Note: SIMMs from older Macintosh systems cannot be used in
this machine. DIMMs that require a 4K refresh rate and 3.3 V
DIMMs cannot be used in this machine.

Specifications Memory - 3

VRAM 2 MB of built-in video memory using synchronous graphic RAM

Cache 256K level 2 cache

Clock/calendar CMOS custom chip with long-life lithium battery
Specifications Disk Storage - 4

Disk Storage

Hard Drive 2 GB IDE hard drive

CD-ROM Custom front-loading CD-ROM drive

Floppy Drive 1.4 MB Apple SuperDrive Manual Insert
Specifications I/O Interfaces - 5

I/O Interfaces

SCSI One external SCSI port; supports up to six external devices

Serial Two RS-232/RS-422 GeoPort-compatible serial ports; mini
DIN-9 connectors

Apple Desktop Bus One Apple Desktop Bus (ADB) port; mini-Din-4 connector
Maximum power draw 500 mA; maximum of three devices
total; additional ADB port on back of keyboard

TV/Radio One TV tuner card that provides connection to an external TV
antenna or cable TV (F-type connector) and FM radio antenna.
(The Apple TV/FM Radio System card is already installed.)
Specifications I/O Interfaces - 6

Video Input Built-in video card provides 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. (Note: this card is different than the video cards used
in earlier entry-level Macintosh systems.)

Sound 16-bit stereo input and output ports (3.5 mm) on back panel
Sample rates of 11.025, 22.05, and 44.1 kHz
Built-in Bose sound system, including Bose bass unit
Front-panel push-button control for volume level and muting
Front headphone jack (3.5 mm)
Built-in omnidirectional electret type microphone
Sound input port (3.5 mm) for stereo sound related to video

Sound Input Port (on Input impedance: >3.5 kilohms nominal, each channel
back panel)
Specifications I/O Interfaces - 7

Video Audio Input Signal-to-noise ratio (SNR): 75 dB minimum, 80 dB typical (A-
Port (next to S-video weighted, 2 Vpp output, 1 kHz, digital record and playback,
port) sound input port to sound output port)
Frequency response: 20 Hz-18 kHz (-3 dB relative to 1 kHz
under the same conditions as the SNR measurement)

Expansion Slots

COMM II slot One internal (comm slot II) expansion slot, supporting
communication cards, such as an internal modem or Ethernet
PCI slot One internal PCI expansion slot, supporting 6.88-inch, 15 W PCI

Note: Install only PCI expansion cards that come with
Macintosh drivers and are compliant with the PCI 2.0 standard.
Specifications I/O Interfaces - 8

Video slot 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.)
Specifications I/O Devices - 9

I/O Devices

Keyboard Twentieth Anniversary Macintosh custom keyboard; draws
25-80 mA (varies with keyboard model used)

Trackpad Solid-state keyboard-mounted trackpad (ADB device); can be
removed and repositioned; draws up to 10 mA

Microphone Apple PlainTalk microphone (optional)
Specifications Video Support - 10

Video Support

Display 12.1-in. diagonal, active matrix flat-panel display with
backlighting; 800x600 pixels; color liquid crystal; 256 or
thousands of colors; color depth: 6 bits each R, G, B

Graphics Modes Resolution Color Bit Depth* Vertical Scan Rate
Supported 640x480 8 60
640x480 16 60
800x600 8 60
800x600 16 60

Video input and 2D acceleration supported in all modes. 1st and
3rd mode do not support 3D acceleration; 2nd mode supports 3D
acceleration, as does 4th mode, depending on the window size.

*16 bit color depth displays 32,768 colors, 8 bit displays
256 colors.
Specifications Electrical - 11


A/C Line Input 90-130 V or 180-264 VAC; RMS single phase, manually
Voltage configured

Input Line 47-63 Hz

Input Power 140 W maximum continuous

Power Supply DC 70 W maximum continuous output

Sleep Mode AC power usage in sleep mode (without PCI cards) less than 30 W
Specifications Physical - 12


Main Unit Height: 17.25 in. (43.8 cm)
Width: 16.5 in. (41.9 cm)
Depth: 10.0 in. (25.4 cm)
Weight: 14.9 lbs. (6.8 Kg)

Bass Unit Height: 10.63 in. (27 cm)
Width: 8.31 in. (21.1 cm)
Depth: 11.75 in. (29.8 cm)
Weight: 10.5 lbs. (4.8 Kg)

Keyboard Height: 1.0 in. (2.5 cm)
Width: 11.5 in. (29.2 cm)
Depth: 8.13 in. (20.7 cm)
Weight: 1.86 lbs. (.84 Kg)
Specifications Environmental - 13


Operating 10