Technical Information Specifications for Power Macintosh G3 minitower computers
Main unit Processor PowerPC™ G3 processor at one of the following speeds: Processor speed System bus speed 233 megahertz (MHz) 266 MHz 300 MHz 66 MHz 66 MHz 66 MHz Memory Dynamic Random-Access Memory 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.
Other memory m 4 MB of read-only memory (ROM) m 8 kilobytes (KB) of nonvolatile parameter memory m 512K to 1 MB 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 Expansion Cards and Additional Memory,” in Setting Up Your Power Macintosh manual.
Mode (kHz) Screen refresh rate Pixel Vertical (MHz) Horizontal (Hz) Clock 1 Maximum color depth (bits per pixel) 2 MB 4 MB 6 MB 640 x 870 75.000 68.850 57.283 16 32 32 800 x 600 800 x 600 800 x 600 800 x 600 800 x 600 56.250 60.317 72.188 75.000 85.061 35.156 37.879 48.077 46.875 53.674 36.000 40.000 50.000 49.500 56.250 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 832 x 624 74.550 49.725 57.283 32 32 32 1024 x 768 1024 x 768 1024 x 768 1024 x 768 1024 x 768 60.004 70.069 75.
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 m Monitor port supporting color and grayscale monitors of various sizes and resolutions (See “Video Modes” earlier in this booklet.) m Two 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 PCI expansion cards.
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 internal and external SCSI devices. The computer has two internal expansion bays. Each one accepts a 3.5" or 5.25" storage device that is up to 1.625" (41.3 mm) high. Some models come with a Zip drive already installed in one of these bays.
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-type audio input ports (-) m Input impedance (preamplifier off ): more than 80 kΩ m Maximum input voltage (preamplifier off ): 1 Vrms = 2.
m Polarity: sync negative (no sync on S-video chroma signal) m Voltage level: 1.0 Vpp ±5% into a 75 Ω resistive load (S-video chroma 0.7 Vpp) m Impedance: 75 Ω source Drive bay specifications The following illustration shows all of the internal storage expansion options. The internal hard disk drive can be replaced with a 3.5" hard disk drive (1" high). The floppy disk drive can be replaced with a 3.5" device (1" high). The CD-ROM drive can be replaced with a 5.25" (or smaller) device (1.
DC power m Continuous output: 161 watts (W ) m Peak output ( for 12 seconds at startup): 210 W 1 Output voltage Maximum current +5 V +5 V (trickle) +3.3 V +12 V –12 V 18.3 A2 0.020 A 12.5 A2 6.2 A 0.4 A 1 Total continuous power output cannot exceed 161 W. 2 Not more than 104 W total combined power.
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.
Modes supported m m m m m m 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 Photo CD: Single-session and multisession Video CD Laser m m m m Type: Semiconductor AlGaAs laser Wavelength: 795 ± 25 nanometers Output power: 0.2 to 0.6 milliwatts 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.
