PowerPC™ G3 processor at one of the following speeds:
Processor speed
233 megahertz (MHz)66 MHz
266 MHz66 MHz
Memory
Dynamic Random-Access Memory
System bus speed
The computer comes with a minimum of 32 megabytes (MB) of Synchronous Dynamic
Random-Access Memory (SDRAM), supplied in removable Dual Inline Memory Modules
(DIMMs). The main logic board has three expansion slots that accept DIMMs that meet these
specifications:
m 8, 16, 32, 64, or 128 MB
m 3.3 volt (V), unbuffered, 64-bit wide, 168-pin
m 100 MHz/10 nanosecond (ns) cycle time or faster
Important
Power Macintosh G3 computers use SDRAM DIMMs. Do not use DIMMs from
older Macintosh computers; they will not fit properly in the DIMM slots.
To increase DRAM to the maximum of 384 MB, fill all three slots with 128 MB DIMMs.
Video Memory
Your computer comes with 2 MB of Synchronous Graphic RAM (SGRAM) video memory built
into the logic board. The logic board contains a video memory expansion slot that accepts a
Small Outline DIMM (SO-DIMM) to increase video memory up to a maximum of 6 MB.
Depending on the configuration you purchased, an SO-DIMM may already be installed in the
slot. The DIMM must meet these specifications:
m a 2 MB or 4 MB SGRAM SO-DIMM
m 32-bit wide, 144-pin
m 83 MHz/12 ns cycle time or faster
Important
Other Memory
Use only an SGRAM SO-DIMM.
m 4 MB of read-only memory (ROM)
m 8 kilobytes (K) of nonvolatile parameter memory
3
m 512K of static RAM used as a level 2 cache integrated into the processor module
For more information and instructions on expanding your DRAM or video memory, see
Chapter 3, “Installing PCI Cards and Additional Memory,” in the Setting Up Your Power Macintoshmanual.
Video Modes
The tables that follow show the modes available for the built-in monitor and for external
monitors connected to the built-in monitor port. The tables also list screen refresh rates in
hertz (Hz) and kilohertz (kHz).
Peripheral component interconnect (PCI) expansion cards that can support other monitors
and special video requirements are available from other manufacturers. See your Appleauthorized dealer for information.
Note: On some monitors from manufacturers other than Apple, the connector pinout
designates one pin for both green video and timing synchronization. These “sync on green”
monitors are not compatible with Power Macintosh computers. If you’re not sure what type of
monitor you have, check with your dealer.
You can use the Monitors & Sound control panel or the Control Strip to set a display mode
that is supported by both your monitor and the built-in video circuitry. If you connect a second
monitor, refer to the manual that came with it for a list of supported display modes. Also see
the manual that came with your computer for more information on connecting a second
monitor.
Display Modes for the Built-in Monitor
1
Maximum color depth
Screen refresh rate
Resolution
640 x 480
640 x 480
640 x 480
640 x 480
1
Image bit depths: 32 bits=millions of colors, 16 bits=thousands of colors, 8 bits=256 colors
4
Vertical
(Hz)
66.7
59.94
75
85
Horizontal
(kHz)
35.000
31.469
37.500
43.269
(bits per pixel)
2 MB4 MB6 MB
32
32
32
32
32
32
32
32
32
32
32
32
Display Modes for the Built-in Monitor
Maximum color depth
(bits per pixel)
2 MB4 MB6 MB
32
32
32
32
Resolution
800 x 600
800 x 600
Screen refresh rate
Vertical
(Hz)
72
85
Horizontal
(kHz)
48.077
53.674
832 x 6247549.725323232
1024 x 7687056.476163232
1
Image bit depths: 32 bits=millions of colors, 16 bits=thousands of colors, 8 bits=256 colors
Modes Supported by the Built-In Monitor Port
Maximum color depth
(bits per pixel)
2 MB4 MB6 MB
32
32
32
32
16
32
32
32
32
32
32
32
Resolution
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
Screen refresh rate
Vertical
(Hz)
72.8
66.7
59.94
75
75
85
Horizontal
(kHz)
37.861
35.000
31.469
37.500
68.850
43.269
1
32
32
1
32
32
32
32
32
32
800 x 600
800 x 600
800 x 600
800 x 600
800 x 600
56.3
60.3
72
75
85
35.156
37.879
48.077
46.875
53.674
32
32
32
32
32
32
32
32
32
32
832 x 6247549.725323232
1
Image bit depths: 32 bits=millions of colors, 16 bits=thousands of colors, 8 bits=256 colors
32
32
32
32
32
5
Modes Supported by the Built-In Monitor Port
Maximum color depth
(bits per pixel)
2 MB4 MB6 MB
16
16
16
16
16
32
32
32
32
32
Resolution
1024 x 768
1024 x 768
1024 x 768
1024 x 768
1024 x 768
Screen refresh rate
Vertical
(Hz)
60
70
75
74.9
84.9
Horizontal
(kHz)
48.363
56.476
60.023
60.241
68.677
1152 x 8707568.681163232
1280 x 960757581616
1280 x 1024
1280 x 1024
1280 x 1024
1600 x 1200
1600 x 1200
1600 x 1200
1600 x 1200
1920 x 1080
1920 x 1080
1
Image bit depths: 32 bits=millions of colors, 16 bits=thousands of colors, 8 bits=256 colors
60
75
85
60
65
70
75
60
72
63.981
79.976
91.146
75
81.250
87.5
93.750
70.313
84.375
8
8
8
8
8
8
8
8
8
16
16
16
16
16
16
16
16
16
1
32
32
32
32
32
32
16
16
16
16
16
16
16
16
Internal Disk Drives
The following drives come factory-installed in your computer:
m Apple SuperDrive 1.4 MB high-density floppy disk drive
m Apple ATA hard disk drive
m 24x-speed ATAPI CD-ROM drive
m Optional Zip drive connected to SCSI chain (If the drive is installed, it has SCSI ID number
5.)
Interfaces
m One ADB port supporting up to three ADB input devices (such as a keyboard, mouse, or
trackball) daisy-chained through a low-speed, synchronous serial bus
6
m Port for mirroring color and grayscale monitors of various sizes and resolutions (See “Video
Modes” earlier in this booklet. The manual that came with the computer contains
information about connecting a monitor to this port.)
m Tw o internal ATA connectors: one supports the built-in hard disk drive and one supports
the built-in CD-ROM drive
m Three internal expansion card slots supporting 7-inch PCI expansion cards. Install only
expansion cards that come with Macintosh drivers and are compliant with the PCI 2.1
™
standard. NuBus
cards cannot be used in these expansion slots.
m One printer port and one modem port. Both ports are RS-232/RS-422 serial ports, 230.4
kilobit (Kbit) per second maximum (up to 2.048 megabit [Mbit] per second if clocked
externally). If the computer came with an internal modem, the external modem port is
covered.
m One built-in 10Base-T Ethernet RJ-45 connector for direct connection to 10Base-T networks
m Three 3.5-mm sound output ports for headphones or amplified speakers
m One built-in microphone that records monophonic (mono) sound
m One 3.5-mm sound input port for stereo sound input. The sound input port supports the
Apple PlainTalk Microphone that comes with some Macintosh computers or can be
purchased separately. The sound input port also supports a standard stereo (miniplug-toRCA) cable adapter for connecting stereo equipment to your computer.
The sound input port does not support the omnidirectional microphone (the round
microphone shipped with some earlier models of Macintosh) or the attenuated RCA
adapter provided with some Macintosh models.
Optional Audio/Video Interfaces
Some Power Macintosh G3 models include the following audio/video interfaces:
m Tw o pairs of RCA-style audio ports for stereo input and output
m Tw o composite video ports for video input and output
m Tw o S-video ports for video input and output
All the video ports support the NTSC and PAL video standards. The video input ports also
support the SECAM video standard.
SCSI Interface
Your computer has one standard SCSI chain, which is capable of transferring data at up to
5 MB per second. The SCSI chain can support up to seven SCSI devices.
The computer has an internal expansion bay that may have come with an optional Zip drive
installed in it. If the bay does not have a Zip drive, an Apple dealer can install one in it.
7
Ω)
Clock/Calendar
m CMOS custom circuitry with long-life battery
Ω
Ω
Ω
Lithium
Lithium
(Li)
(Li)
Audio System
Warning
provider for a battery replacement. Do not attempt to replace the clock battery yourself.
If the clock begins to lose accuracy, see an Apple-authorized dealer or service
m Custom sound circuitry, including a stereo generator (digital-to-analog converter, or DAC)—
capable of driving stereo miniplug headphones or audio equipment—and stereo sampling
hardware (analog-to-digital converter, or ADC) for recording stereo sound
m 8-bit and 16-bit stereo input and output
m Sample rates of 44.1, 22.05, and 11.025 kilohertz (kHz)
m Preamplifier enabled for input gains greater than 22.5 decibels (dB)
Typical Audio Specifications
Sound input using the sound input port ( ≈)
m Input impedance (preamplifier off): more than 80 kilohm (k
m Maximum input voltage (preamplifier off): 1 Volt (V
) = 2.8 Volts peak-to-peak (Vpp),
rms
nominal
m Input impedance (preamplifier on): more than 5 k
m Maximum input voltage (preamplifier on): 62 millivolts (mV
) = 175 mVpp, nominal
rms
Sound output using the sound output port ( -)
m Output impedance: 33
m Maximum output voltage: 0.94 V
Ω, nominal
= 2.65 V
rms
pp
Noise, distortion, and bandwidth
m Sound input signal-to-noise ratio (SNR): 85 dB unweighted (add +8 dB to estimate A
weighting)
m Total harmonic distortion: 0.05%
m Bandwidth: 20 Hz–20 kHz at 44.1-kHz sample rate (Other sample rates scale the upper
cutoff frequency.)
Sound input using the optional RCA-style audio input ports ( -)
m Input impedance (preamplifier off): more than 80 k
m Maximum input voltage (preamplifier off): 1 V
= 2.8 Volts peak-to-peak (Vpp),
rms
nominal
m Input impedance (preamplifier on): more than 5 k
m Maximum input voltage (preamplifier on): 62 millivolts (mV
) = 175 mVpp, nominal
rms
8
Sound output using the optional RCA-style audio output ports ( -)
m Output impedance: 400
m Maximum output voltage: 1 V
= 2.8 Vpp, nominal
rms
Noise, distortion, and bandwidth
m Audio input signal-to-noise ratio (SNR): 85 decibels (dB) unweighted (add +8 dB to
estimate A weighting)
m Total harmonic distortion: 0.05%
m Bandwidth: 20 Hz–20 kHz at 44.1-kHz sample rate (Other sample rates scale the upper
cutoff frequency.)
Video System
Video Input
m Type: Composite or S-video
m Standards supported: NTSC, PAL, and SECAM
m Resolution supported: 320 x 240, which scales to any size up to the size of the monitor
m Polarity: sync negative
m Voltage level: 0.7 V
minimum, 1.0 Vpp typical, 1.4 Vpp maximum
pp
m Impedance: 75 ohms (Ω) internally terminated
Ω
Video Output
m Type: Composite and S-video
m Standards supported: NTSC and PAL
m Resolutions supported: 640 x 480, 800 x 600, and 832 x 624
m Polarity: sync negative (no sync on S-video chroma signal)
m Voltage level: 1.0 V
±5% into a 75 Ω resistive load (S-video chroma 0.7 Vpp)
pp
m Impedance: 75 Ω source
AC Line Input
m Line voltage: 90–264 volts alternating current ( V AC), RMS, single phase
m Frequency: 50–60 Hz
m Power: 300 watts (W ) maximum continuous
m Power in shut down mode (with computer plugged in and power switch turned on):
1.5 W
m Power in sleep mode (with optional Zip drive installed): 41 W
9
DC Power
m Continuous output: 140 watts (W)
m Peak output (for 12 seconds at start-up): 150 W
Output voltageMaximum current
+5 V18.0 A
+5 V (trickle)0.08 A
+3.3 V
1
10.0 A
+12 V4.0 A
–12 V0.2 A
1
For each ampere drawn from the +3.3 V supply, the same amount of current is decreased from the +5.0 V supply.
Keyboard
m Supports all Apple Desktop Bus (ADB) keyboards
Mouse
m Supports all models of the ADB mouse
Power Requirements for Devices You Can Connect
10
Apple Desktop Bus (ADB)
m The mouse draws up to 10 milliamperes (mA).
m The keyboard draws 25–80 mA (varies with keyboard model used).
m The maximum current available for all ADB devices is 500 mA.
The ADB port can support up to three ADB devices.
Audio and Telecommunications Devices
The following table shows power allowances for external devices connected to input ports.
DeviceVoltageCurrentPower
Microphone+5 V20 mA100 mW
A device connected to the printer port or modem port+5 V500 mA2.5 W
Expansion Cards and Other Internal Devices
If you add an expansion card or a storage device to your computer, make sure the
component’s power requirements don’t exceed the maximum power allowances allocated to it
by the computer.
The maximum power allowances for expansion cards in your computer can accommodate
three 15-watt cards, two 25-watt cards, or one 15-watt card and one 25-watt card. Some
detailed guidelines are presented in the following table.
DeviceVoltageCurrentPower
Expansion card (15 watts)
1
+5 V
+12 V
–12 V
+3.3 V
3 A
0.500 A
0.100 A
2 A
15 W
6 W
1.2 W
6.6 W
Expansion card (25 watts)
2
+5 V
+12 V
–12 V
+3.3 V
Storage devices (such as a hard disk)+5 V
+12 V
+12 V
1
15-watt expansion cards should not consume more than 15 watts of total power.
2
Two 5-watt expansion cards should not consume more than 25 watts of total power.
3
Peak power is for startup only and must not occur in normal operation.
CD-ROM Drive
Disc Speed
m 24x (twenty-four-times speed)
Disc Diameters Supported
m 120 mm (4.7 inches)
m 80 mm (3.2 inches)
Data Capacity
m 656 MB, Mode 1
m 748 MB, Mode 2
5 A
0.500 A
0.100 A
2 A
3 A
2.3 A
6.2 A peak
25 W
6 W
1.2 W
6.6 W
15 W
27.6 W
3
—
11
Modes Supported
m Audio CD
m CD-ROM: Modes 1 and 2
m CD-ROM XA: Mode 2, Forms 1 and 2
m CD-I: Mode 2, Forms 1 and 2
m Photo CD: Single-session and multisession
Laser
m Type: Semiconductor AlGaAs laser
m Wavelength: 795 ± 25 nanometers
m Output power: 0.2 to 0.6 milliwatts
m Beam divergence: 55°
Environment
m Operating temperature: 10° C to 40° C (50° F to 104° F)
m Storage temperature: –40° C to 47° C (–40° F to 116.6° F)
m Relative humidity: 5% to 95% (noncondensing)
m Altitude: up to 3048 m (up to 10,000 ft.)
Size and Weight
WeightHeightWidthDepth
Main unit
1
27 kg
498 mm402 mm450 mm
59.5 lb.19.61 in.15.83 in.17.72 in.
1
Weight varies depending on type of hard disk and may be greater if optional devices are installed.