Home Desktops Apple iMac G3 (Revision B) Apple · iMac
Released October 1998
A colourful all-in-one PowerPC desktop with a built-in CRT and USB peripherals.
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Type All-in-one
Processor PowerPC G3 233 MHz (iMac)
Memory 32 MB – 256 MB
Storage 4 GB
Screen 15″
Weight –
Processor PowerPC G3 233 MHz (iMac)
CPU cores 1
Graphics ATI RAGE Pro (6 MB)
Memory 32 MB or 256 MB
Storage 4 GB
CPU 233 MHz PowerPC G3 with 66 MHz system bus and 512 KB backside L2 cache. The generic chip record names no supplier; MacGeneration identifies a Motorola PowerPC 750 in its reviewed Revision B unit.
GPU ATI RAGE Pro graphics with 6 MB video memory; Apple’s developer history confirms the graphics change from the original RAGE IIc model.
Memory type 32 MB SDRAM standard, two SO-DIMM slots. Current retained Apple Revision B sheet supports up to 256 MB; the older developer history gives 128 MB. Configurations use the current maximum, with the conflict recorded.
Storage type 4 GB IDE hard drive and tray-loading 24x CD-ROM. Display
Screen size 15″
Resolution 1024 × 768
Refresh rate 75 Hz
Display type Nominal 15-inch CRT, 13.8-inch viewable diagonal; no fixed LCD native resolution.
Display features 1024 × 768 at 75 Hz, 800 × 600 at 95 Hz and 640 × 480 at 117 Hz (EveryMac exact A/B specification). Connections
Ports 2 × USB-A, Ethernet, 2 × headphone jack
Ethernet 0.1 Gb/s
Back ports Two USB ports, 10/100BASE-T Ethernet, 56K modem and audio line-in/out, plus two front headphone jacks. The retained combined maker sheet lists IrDA; Apple’s developer comparison lists it only for the original revision, while MacGeneration’s physical Revision B review shows the infrared window. No standard FireWire or VGA output.
Speakers Built-in stereo speakers and microphone.
Keyboard and mouse Apple USB Keyboard and round Apple USB Mouse. Design and power
Type All-in-one
Operating system macOS
Size and weight detail Maker retained sheet gives height 15.8, width 15.2 and depth 17.6 inches, weight 40 pounds. Metric figures from the original revision are not borrowed.
In the box Mac OS 8.5. Conservative October 1998 sale month follows MacGeneration’s exact Revision B retrospective; published introduction days differ and are not treated as a verified worldwide first-sale day. Configurations Processor Memory Storage Storage type Graphics PowerPC G3 233 MHz (iMac) 32 MB 4 GB Hard drive ATI RAGE Pro (6 MB) PowerPC G3 233 MHz (iMac) 256 MB 4 GB Hard drive ATI RAGE Pro (6 MB)
Pros and cons Pros + Built-in display and speakers+ USB peripheral connections+ Wired Ethernet connectionCons − Single-core processor− CRT has 13.8-inch viewable area− Limited internal expansionPrevious model: iMac G3 (1998) . Newer model: iMac G3 (Early 1999) .
