On January 24, 1984, Apple announced the Macintosh to their Board of Directors and to the world. The tiny computer was a radical departure from the large Lisa with it's 12" screen, just as the Lisa itself had been a huge departure from the Apple II series and the growing family of MS-DOS computers on the market.
But before we look at the Macintosh, let's look at the PC market in early 1984. The February 1984 issue of Byte magazine featured the Macintosh on the cover (left), and ad for the ImageWriter printer inside the front cover, and an editorial decrying the creativity lost in the quest for compatibility on page 4.
Glancing through the ads, we see Commodore, Atari, and Apple still selling 6502-based computers, Radio Shack selling TRS-DOS and MS-DOS machines, lots of CP/M systems still on the market, and a growing number of IBM compatible computers.
The back cover contains an ad for the Tandy TRS-80 Model 2000, perhaps the only PC ever designed around the 80186 processor. Tandy claimed the 8 MHz true 16-bit CPU was a big improvement over the 4.77 MHz 8088 (with an 8-bit bus) that IBM used. And for just $1,500 extra, you could buy the Model 2000 with a 10 MB hard drive.
Texas Instruments was pushing its Professional Computer, an MS-DOS machine with a better keyboard than IBM's, higher capacity floppies than IBM, more memory expansion space than IBM (768KB vs. 640KB), better standard graphics than the IBM, and a better CPU than IBM's PC, Intel's 16-bit 8086. Of course, all those improvements made this MS-DOS computer less than 100% IBM compatible.
Heathkit was pushing the H-100, their kit version of the Zenith Z-100 that Byte columnist Jerry Pournelle loved (especially the keyboard) and the U.S. Navy bought a lot of (I once worked in a Zenith store in Virgina Beach, VA -- it's amazing how dusty a shipboard computer can get after a few years). The Z-100's claim to fame: an Intel 8085 for CP/M software and an 8088 for MS-DOS.
Creativity vs. compatibility. MS-DOS was winning mindshare, since it drove both the 100% IBM compatible computers and the semi-compatible creative not quite clones.
An interesting failure of the era was the Dimension 68000, which contained "the microprocessors found in all of today's popular personal computers." Apparently, getting the 6502, Z-80, 8088, and 68000 to behave with each other was more than Micro Craft could pull off, since I don't believe the computer ever hit the market.
One more interesting historical footnote before we look at the Macintosh: the IBM CS-9000 Lab Computer was also featured in this issue of Byte. What sets it apart is that it was not based on any Intel chip, but on the same 68000 found in the Lisa and Macintosh.
The Macintosh
That's the computer market of 1984. Most computers, even DOS ones, shipped with 64KB or 128KB of memory, and had one or two 5.25" floppy drives. Hard drives, when available, where $1,500 options.
The Macintosh was different. First, there was the mouse, just like Lisa had. In fact, Apple was so adamant that you use the mouse that the early Mac keyboard had no arrow keys. (The Ctrl key was also a later innovation.)
Then there was that 3.5" floppy drive storing 400KB of date -- 25% more than the 320KB 5.25" disks in the IBM world.
But when you turned it on, the Macintosh showed it's greatest difference, a graphical user interface. Although similar to the interface from the Lisa, the Mac used square pixels, making it far easier to accurately map graphics to the screen.
A glance at the screen shot of MacWrite (p. 48) looks remarkably familiar. There's the menu bar we all know and love: Apple, File, Edit, Search, Format, Font, Style, along with pull-down menus. The menu bar clock and heirarchical menus would come later, but you'd certainly find the experience comfortably familiar.
The 8 MHz 68000 processor was 60% faster than the 5 MHz one found in the Lisa, so the Mac was pretty fast in its day. (As noted above, the Tandy Model 2000 used a cutting edge 8 MHz 80186 CPU, which was about equal in power to the 8 MHz 68000.)
Memory prices were a limiting factor, which is the main reason the original Macintosh shipped with 128KB instead of 256 KB. This probably shaved $200-400 from the retail price!
But Apple cheated there, building huge portions of code into a 64KB ROM. This included routines for sound, drawing text, doing graphics, and more, so programmers didn't have to reinvent these procedures and could write more compact code.
Essentially, the Mac was a 192KB computer where 64KB was already programmed -- or at least that was the spin Apple tried to put on it.
As for expansion slots, Apple claimed the high speed serial bus would provide all the expansion the Mac would ever need. The RS-422 serial ports supports 230.4kbps speed as shipped from the factory, but could be externally clocked to four times that speed, something that LocalTalk accelerators would take advantage of in the years ahead.
Still, the Mac had its limitations. One floppy wasn't enough unless you had the patience to shuffle 400KB disks frequently, so the external floppy became a popular accessory. The same ImageWriter that worked with the Apple II series could print Mac graphics beautifully, so that also became a very popular part of the Macintosh system. (BTW, I can't find any mention of laser printers in this issue of Byte.)
Oh, Apple didn't introduce the Macintosh all by itself. At the same January 24 meeting, they unveiled a less expensive Lisa, the Lisa 2. The new Lisa used the same 3.5" disk as the Mac and could run either the Lisa OS or the Mac OS. It shipped with 512 KB of memory and was even available with a 10 MB hard drive. In fact, only the Lisa and Lisa 2 had enough memory for anyone to do program development for the RAM-limited Macintosh. And all the Mac software run on the Lisa 2 could automatically take advantage of the extra memory.
Realizing the limitations of the 128KB Macintosh and seeing memory prices drop, Apple introduced the Fat Mac with 512 KB of memory in September. The original Mac, commonly called the 128K, remained on the market until October 1985, leaving the Mac 512K as the only model until January 1986.
On the DOS side, IBM introduced the first 80286-based PC during 1984, running at 6 MHz and introducing high density 1.2 MB 5.25" floppy disks. Competitors soon upped the ante to 8 MHz -- the same clock speed as the Macintosh.
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