Apple Mac IMac 266 mHz Caddy Loading (M4984)

iMac G3 Caddy Loading

The iMac 266mHz (M4984) is a G3 (PowerPC 750) based Powermac system. It was shipped with an apple stock 6 gig hard drive and 32 megs of 144pin memory all all on a single caged computer, slung under the main chassis of the CRT screen.  It came with a 15 inch CRT screen built into the case, but lacked any floppy drive or mouse.  This, luckily, is not an issue as floppy disks are a thing of the past!

It was offered in five different colors — lime (lime green), strawberry (pinkish-red), blueberry (royal blue), grape (purple), and tangerine (orange-yellow).

fruit flavoured iMac G3The 266 mHz iMac system was shipped with matching apple standard USB Keyboard and Puck Mice. A power chord was included with the unit.

Apart from different color options, the iMac G3/266 (Fruit Colors) models were quite similar to the iMac (Revision B) that the line replaced, but shipped with a larger 6.0 GB hard drive and lacked the “Mezzanine” internal expansion slot and IrDA capabilities.

iMac Caddy loading motherboardThe motherboard layout to the caddy loading iMac is pretty easy to work with (once you’ve removed it from the mac itself).  To the left is a memory stick which makes up the video ram (SGRAM) for the computer.  This can be upgraded to a maximum of 6 MB.  The cage (top center) contains the G3 CPU.  Flip off the cage and you have access to the cpu and memory that is installed above and below the daughtercard.  The CDrom drive hides the hard drive.  Remove 2 screws, slide out the optical drive and replace the hard drive itself with a larger sized unit.

Access to the Pram battery is under the grey cable directly below (or in front of) the cpu cage.  When the pram battery has failed and the mac no longer boots, this should be replaced and the mac reset by pressing and holding down the microswitch located top of the picture to the right of the cpu cage for 30 seconds.  Reassemble and power on the mac afterwards.

Introduction Date: January 5, 1999 Discontinued Date: April 14, 1999
Processor Speed: 266 MHz Processor Type: PowerPC 750 (G3)
Details: N/A
Processors: 1 Geekbench: N/A
Processor Upgrade: G3 Daughtercard FPU: Integrated
Details: Third-party processor upgrade cards were released including the iMAXpowr G3/466 and the iMaxPowr G4/433, which were both showcased in 2000 and were compatible with the Apple iMac G3 233 (Rev A & B), Apple iMac G3 266mHz and Apple iMac G3 333mHz
System Bus Speed: 66 MHz Cache Bus Speed: 133 MHz
ROM/Firmware Type: Open Firmware ROM/Firmware Size: 1 MB
Details: The Boot ROM is roughly 1 MB, other instructions are loaded into RAM.
L1 Cache: 64k L2/L3 Cache: 512k (backside)
Details: The 512k of backside cache has a 133 MHz bus.
RAM Type: PC66 SDRAM Min. RAM Speed: 10 ns
Details: Uses 144-pin PC66 SO-DIMM memory modules. Note that PC-100 and PC-133 memory modules can be utilised in these iMacs due to their “backward compatibility”
Standard RAM: 32 MB Maximum RAM: 512 MB*
Details: *Apple reports that this model can support a maximum of 128 MB of RAM. “Unofficially” this model can support 512 MB of RAM (two 256 MB modules).
Motherboard RAM: None RAM Slots: 2
Video Card: Rage Pro Turbo VRAM Type: SGRAM
Details: ATI Rage Pro Turbo video with 6 MB of VRAM.
Standard VRAM: 6 MB Maximum VRAM: 6 MB
Built-in Display: 15.0″ (13.8″) Native Resolution: 800×600*
Details: *15.0″ (13.8″ viewable area) display supports 640×480 at 117 Hz, 800×600 at 95 Hz, and 1024×768 at 75 Hz.
2nd Display Support: None 2nd Max. Resolution: N/A
Details: N/A
Standard Hard Drive: 6.0 GB Int. HD Interface: EIDE (ATA-3)
Standard Optical: 24X CD-ROM Standard Disk: None
Details: 24X tray-loading CD-ROM drive.
Standard Modem: 56.6k (Internal) Standard Ethernet: 10/100Base-T
Standard AirPort: None Standard Bluetooth: None
USB Ports: 2 (1.1) Firewire Ports: None
Details: This system has two USB 1.1 ports.
Expansion Slots: None Expansion Bays: None
Details: The original “bondi” blue iMac models have a “Mezzanine” expansion slot that was underutilized by third-parties, but the “Fruit Colors” iMac models do not.
Incl. Keyboard: Apple USB Keyboard Incl. Input: Apple USB Mouse*
Case Type: All-in-One Form Factor: iMac (Fruit Colors)
Apple Order No: M7345LL/A* Apple Subfamily: iMac – Fruit Colors
Apple Model No: M4984 (EMC None) Model ID: iMac,1
Details: Please note that these identifiers refer to more than one model.
Battery Type: 3.6V Lithium Pram Battery Life: N/A
Pre-Installed MacOS: 8.5.1 Maximum MacOS: X 10.3.9
MacOS 9 Support: Boot/Classic Mode Windows Support: Emulation Only
Details: This model is capable of booting in Mac OS 9 and using Mac OS 9 applications within the Mac OS X “Classic” environment.
Dimensions: 15.8 x 15.2 x 17.6 Avg. Weight: 38.1 lbs. (18.1 kg)