Sold for USD 3,300 (or 3200, according to some sources), the Macintosh 512K was nicknamed “Fat Mac” for its increased (four-fold) RAM memory but was otherwise identical to the original Macintosh, as one can see from the dual-purpose motherboards.

In an 1984 interview in Byte with three of the original designers of the Macintosh, Jef Raskin actually revealed that the expansion was planned since the beginning and wasn’t an afterthought.

At the question

You started with 64K bytes and it was released with 128K bytes, and there is constant talk of a half-megabyte Mac. When did a half megabyte creep into the design philosophy?

Raskin answered:

Very early on Burrell [Smith, the motherboard designer, nda] pointed out that it’s very easy to make a design, once you had the 68000 in place, where you could just take out 64K-bit chips and put in 256K-bit chips. I’ve always believed that you just simply take the largest chip that is economically feasible to use in terms of the memory, and if they’re bit-wide chips and you use 8 or 16 of them, then that should be the size of your memory. [...] Burrell loves designing for it, software part portion had no trouble handling that, and it was was very clean. When the 256K-bit chips come you just plug in all those and everything runs just about the same.

And things ran just about the same, but better: the 512k greatly improved application usage and even some operations helping avoid issues such as the “Disk Swapper’s Elbow”.

It was discontinued in April 1986, replaced by the 512Ke which had bigger ROMs (128K instead of 64) and used more capacious 800KB floppy disks.

The motherboard in the picture was gently provided by Maurizio Buso

Macintosh, along with three powerful new Lisa 2 computers, forms the basis of the Apple 32 SuperMicro family of computers. All systems in the family run Macintosh software.

and that

“We believe that Lisa Technology represents the future direction of all personal computers,” said Steven P. Jobs, Chairman of the Board of Apple. “Macintosh makes this technology available for the first time to a broad audience–at a price and size unavailable from any other manufacturer. By virtue of the large amount of software written for them, the Apple II and the IBM PC became the personal-computer industry’s first two standards. We expect Macintosh to become the third industry standard.”

This was actually a marketing attempt Apple made to capitalize on the distinction between the old 8 and 16 bit and the newer and more powerful 32 bit microcomputers and at the same time a way to present the Mac and the Lisa together to help a bit with the (poor) sales of its’ first computer with a GUI.

The “Apple 32 SuperMicros” monicker was actually used internally at Apple since November 1983 and than used in some of the promotional material the following year, grouping the Mac with three Lisa configurations (without an external hard drive, and with a 5 MB or 10 MB ProFile drive).

The brochure scans are taken from ballistikcoffeeboy ‘s photostream on Flickr.

“The people who are doing the work are the moving force behind the Macintosh. My job is to create a space for them, to clear out the rest of the organization and keep it at bay. I can’t spend enough time here, unfortunately, because I have other responsibilities. But every spare moment I have, I dash back because this is the most fun place in the world.

This is the neatest group of people I’ve ever worked with. They’re all exceptionally bright, but more importantly they share a quality about the way they look at life, which is that the journey is the reward. They really want to see this product out in the world. It’s more important than their personal lives right now.

The Apple II had a magical feel about it. You couldn’t quantify it, but you could tell. The Macintosh is the second thing in my life that’s ever felt that way. Opportunities like this don’t come along very often. You know somehow that it’s the start of something great. So everyone wants it to be perfect and works really hard on it. Everyone feels a personal responsibility for the product.

The Macintosh is the future of Apple Computer. And it’s being done by a bunch of people who are incredibly talented but who in most organizations would be working three levels below the impact of the decisions they’re making in the organization. It’s one of those things that you know won’t last forever. The group might stay together maybe for one more iteration of the product, and then they’ll go their separate ways. For a very special moment, all of us have come together to make this new product. We feel this may be the best thing we’ll ever do with our lives.”

Steve Jobs in 1984 in the first issue of Macworld

The motherboard pictured was gently provided by Maurizio Buso

The ad, which was then broadcast in a shortened 30 seconds version, borrowed the core of George Orwell’s novel “Nineteen Eighty-Four” and its dystopian future under a “Big Brother”, unanimously perceived as an allusion to IBM, Apple’s adversary on the market.

Altough most sources mention the january date, the broadcasting history of the ad is actually quite rich and complex.

Starting on 17 January it was screened prior to previews in movie theaters for a few weeks and before that, it was aired publicly on television on the night of 15 December 1983 by KMVT in Idaho. This was a clever move by the advertising agency, Chiat/Day, so that “1984″ could be submitted to award ceremonies for that year.

Before that, on the 20th of October 1983, Ridley Scott’s visionary masterpiece promoting the Mac was shown during Apple’s annual sales conference in Honolulu to “a rapturous reception, almost as apocalyptic as the commercial itself”.