20th Anniversary Macintosh (TAM)

 The Twentieth Anniversary Macintosh (or "TAM") is a limited-edition personal computer released in 1997 to mark Apple's 20th anniversary. The machine was a technological showcase of the day, boasting a number of features beyond simple computing, and with a price tag aimed at the "executive" market. 

April 1, 1996, marked 20 years since the day that Steve Jobs, Steve Wozniak, and Ronald Wayne came together to form Apple Computer. As this milestone arrived and came to the attention of Apple's then-current executives, the decision was made to release a limited edition Macintosh computer to celebrate—and so the "Spartacus" (or "Pomona", or "Smoke & Mirrors") project was born.

The normal time-span to develop a new Macintosh computer was 18+ months, although available time was less. However, the design team had already been working on several "dream" concepts, and soon settled on the most feasible of those: the (almost) all-in-one LCD-based design. To reduce development time, many off-the-shelf components were used on the new computer's internals.

The TAM was announced almost 20 years to the day after Jobs and Wozniak incorporated the company, in January 1997 at MacWorld Expo, San Francisco. It was given a release date of March 20, 1997, with a retail price of £5,545 or €6,637. Originally intended as a mainstream product, the marketing group turned it into a pricey special edition.

Upon its unveiling, the TAM was predicted to cost US$9,000, which would include a direct-to-door concierge delivery service. At release the price was reduced to US$7,499. In the middle of the machine's sales lifespan Apple dropped the price further to around US$3,500, and finally upon discontinuation in March 1998 the price was set to US$1,995. Customers who paid full price for the TAM, and then complained to Apple when the price was so drastically cut, were offered a free high-end PowerBook as compensation.

The TAM featured a 250 MHz PowerPC 603ev processor and 12.1" active matrix LCD from a PowerBook 3400c/G3 Kanga, powered by an ATI 3D Rage II video chipset with 2 MB of VRAM capable of displaying up to 16-bit color at either 800x600 or 640x480 pixels. It had a vertically mounted 4x SCSI CD-ROM and an Apple floppy SuperDrive, a 2 GB ATA hard drive, a TV/FM tuner, an S-Video input card, and a custom-made Bose sound system including two "Jewel" speakers and a subwoofer built into the externally located power supply "base unit".

A thick "umbilical" cable connects the base unit to the head unit, supplying both power, and communications for the subwoofer. The umbilical connects via a multi-pin connector, which is a possible cause of the TAM's one major fault: the "speaker buzz". Inspections of units that received a repair by Apple due to the speaker buzz found one or more extra resistors had been installed in the umbilical. Ensuring the connectors are free of dust/dirt has also been known to resolve the "buzz", though the buzz ultimately only affected a small percentage of machines. An Apple Engineer noted that the thick umbilical was intended to power a higher end CPU, however that option was ultimately curtailed, though the diameter of the umbilical remained.

The TAM came with a unique 75 key ADB keyboard which featured leather palm-rests and a trackpad instead of a mouse. The trackpad could be detached from the keyboard if desired, with a small leather insert found underneath the keyboard ready to fill the gap. When not required, the keyboard could slide under the TAM's head unit, leaving the trackpad exposed for continued access. The TAM also came with a remote control (standard with the Apple TV/FM Tuner card), but also featured buttons on the front panel that could control sound levels, CD playback, brightness, contrast, and TV mode. The pre-installed operating system was a specialized version of Mac OS 7.6.1, which allowed control over those features. It is the last Macintosh model able to boot and run System 7 natively.

Expandability was offered via a 7-inch PCI slot and Apple Communication slot II for the addition of Ethernet. Later G3 upgrade options offered by Sonnet and NewerTechnologies made use of the TAM's Level II Cache slot, which allow the computer to reach speeds of up to 500 MHz. All of these options come at the price of the TAM's slim profile. The back panel must be removed, and replaced with an (included) "hunchback" cover that adds several inches to the depth of the machine.

The TAM featured a unique startup chime that was made exclusively for this model, and was not used on any other Macintosh models.

The TAM was only released in the USA, Japan, France, Germany, and the UK.

Both of Apple's founders, Steve Wozniak and Steve Jobs, received a TAM. When "Woz" allowed people to see into his office via webcam in the late 1990s, his TAM was visible on his desk.

Due to the scarcity of scale, rather than training all Apple authorized technicians in repairing the TAM, Apple opted to ship faulty units to three central locations worldwide: one per continent. The US location was the Eastman Kodak Company's service center in Rochester, New York. Apple's Service Source CD, containing information for authorized technicians in the repair of Apple computers, lists the TAM as a "closed unit", to be returned to said repair locations for all repairs. It does not contain a "take apart" guide for the TAM.