The Macintosh II is a personal computer designed, manufactured and sold by Apple Computer, Inc. from March 1987 to January 1990. It is the first model of the Macintosh II family, and the first Macintosh to support a color display. When first introduced, a basic system with 20 MB drive and monitor cost US$5,498 (equivalent to $12,125 in 2018). With a 13-inch color monitor and 8-bit display card the price was around US$7,145 (equivalent to $15,757 in 2018). This price placed it in competition with workstations from Silicon Graphics, Sun Microsystems, and Hewlett-Packard.
A Macintosh II
|Developer||Apple Computer, Inc.|
|Product family||Macintosh II|
|Release date||March 2, 1987|
|Introductory price||US$5,498 (equivalent to $12,125 in 2018)|
|Discontinued||January 15, 1990|
|Operating system||4.1–7.1.1 (Pro), 7.5–7.5.5 or with 68030 32-bit upgrade Mac OS 7.6.1|
|CPU||Motorola 68020 @ 16 MHz|
|Memory||1 MB, expandable to 8 MB (128 MB via FDHD upgrade kit) (120 ns 30-pin SIMM)|
Eighteen months after its introduction, the Macintosh II was updated with a more powerful CPU and sold as the Macintosh IIx. In early 1989, the more compact Macintosh IIcx was introduced at a price similar to the original Macintosh II, and by the beginning of 1990 sales stopped altogether. Motherboard upgrades to turn a Macintosh II into a IIx or Macintosh IIfx were offered by Apple.
The Macintosh II project was begun by Dhuey and Berkeley during 1985 without the knowledge of Apple co-founder and Macintosh division head Steve Jobs, who opposed features like expansion slots and color, on the basis that the former complicated the user experience and the latter did not conform to WYSIWYG, since color printers were not common. He instead wanted higher-resolution monochrome displays for the Macintosh.
Initially referred to as "Little Big Mac", the Macintosh II was codenamed "Milwaukee" after Dhuey's hometown, and later went through a series of new names, including "Reno", "Becks", "Cabernet", "Uzi" and "Paris" (after Jean-Louis Gassée, Apple's then products manager, who protected the semi-clandestine project from cancellation). After Jobs was fired from Apple in September 1985, the project could proceed openly.
The Macintosh II was introduced at the AppleWorld 1987 conference in Los Angeles, with low-volume initial shipments starting two months later. Retailing for US $5,498, the Macintosh II was the first "modular" Macintosh model, so called because it came in a horizontal desktop case like many IBM PC compatibles of the time. All previous Macintosh computers used an all-in-one design with a built-in black-and-white CRT.
The Macintosh II had drive bays for an internal hard disk (originally 40 MB or 80 MB) and an optional second floppy disk drive. It, along with the Macintosh SE, was the first Macintosh computer to use the Apple Desktop Bus (ADB) introduced with the Apple IIGS for keyboard and mouse interface.
The primary improvement in the Macintosh II was Color QuickDraw in ROM, a color version of the graphics language which was the heart of the machine. Among the many innovations in Color QuickDraw were an ability to handle any display size, up to 8-bit color depth, and multiple monitors. Because Color QuickDraw was included in the Macintosh II's ROM and relied on new 68020 instructions, earlier Macintoshes could not be upgraded to display color.
CPU: The Macintosh II is built around the Motorola 68020 processor operating at 16 MHz, teamed with a Motorola 68881 floating point unit. The machine shipped with a socket for an MMU, but the "Apple HMMU Chip" (VLSI VI475 chip) was installed that did not implement virtual memory (instead, it translated 24-bit addresses to 32-bit addresses for the Mac OS, which would not be 32-bit clean until System 7).
The original Macintosh II did not have a PMMU by default. It relied on the memory controller hardware to map the installed memory into a contiguous address space. This hardware had the restriction that the address space dedicated to bank A must be larger than those of bank B. Though this memory controller was designed to support up to 16MB 30-pin SIMMs for up to 128MB of RAM, the original Macintosh II ROMs had problems limiting the amount of RAM that can be installed to 8MB. The Macintosh IIx ROMs that also shipped with the FDHD upgrade fixed this problem, though still do not have a 32-bit Memory Manager and cannot boot into 32-bit addressing mode under Mac OS (without the assistance of MODE32). MODE32 contained a workaround that allowed larger SIMMs to be put in Bank B with the PMMU installed. In this case, the ROMs at boot think that the computer has 8MB or less of RAM. MODE32 then reprograms the memory controller to dedicate more address space to Bank A, allowing the additional memory in Bank B to be accessed. Since this makes the physical address space discontiguous, the PMMU is then used to remap the address space into a contiguous block.
Graphics: The Macintosh II includes a graphics card that supports a true-color 16.7 million color palette and was available in two configurations: 4-bit and 8-bit. The 4-bit model supports 16 colors on a 640×480 display and 256 colors (8-bit video) on a 512×384 display, which means that VRAM was 256 KB. The 8-bit model supports 256-color video on a 640×480 display, which means that VRAM was 512 KB in size. With an optional RAM upgrade (requiring 120ns DIP chips), the 4-bit version supports 640×480 in 8-bit color. The video card does not include hardware acceleration of drawing operations.
Storage: A 5.25-inch 40 MB internal SCSI hard disk was optional, as was a second internal 800 kilobyte 3.5-inch floppy disk drive.
Expansion: Six NuBus slots were available for expansion (at least one of which had to be used for a graphics card, as the Mac II had no onboard graphics chipset and the OS didn't support headless booting). It is possible to connect as many as six displays to a Macintosh II by filling all of the NuBus slots with graphics cards. Another option for expansion included the Mac286, which included an Intel 80286 chip and could be used for MS-DOS compatibility.
The original ROMs in the Macintosh II contained a bug that prevented the system from recognizing more than one megabyte of memory address space on a Nubus card. Every Macintosh II manufactured until approximately November 1987 had this defect. This happened because Slot Manager was not 32-bit clean. Apple offered a well-publicized recall of the faulty ROMs and released a program to test whether a particular Macintosh II had the defect. As a result, it is rare to find a Macintosh II with the original ROMs.
Accessories: The Macintosh II and Macintosh SE were the first Apple computers since the Apple I to be sold without a keyboard. Instead the customer was offered the choice of the new ADB Apple Keyboard or the Apple Extended Keyboard as a separate purchase. Dealers could bundle a third-party keyboard or attempt to upsell a customer to the more expensive (and higher-profit) Extended Keyboard.
- Macintosh II CPU: 1 MB RAM.
- Macintosh II 1/40 CPU: 1 MB RAM, internal 40-megabyte SCSI HDD.
- Macintosh II 4/40 CPU: 4 MB RAM, internal 40-megabyte SCSI HDD.
Timeline of Macintosh II models
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- Series: The 24-bit ROM Blues by Adam C. Engst, Tidbits, April 22, 1991 (retrieved September 21, 2009)
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- "Macintosh II High Resolution Video Card". lowendmac.com. June 7, 1989. Retrieved April 11, 2018.
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- "Macintosh II - Product Details" (PDF). Apple.