The Macintosh Plus computer is the third model in the Macintosh line, introduced on January 16, 1986, two years after the original Macintosh and a little more than a year after the Macintosh 512K, with a price tag of US$2599. As an evolutionary improvement over the 512K, it shipped with 1 MB of RAM standard, expandable to 4 MB, and an external SCSI peripheral bus, among smaller improvements. It originally had the same generally beige-colored case as the original Macintosh ("Pantone 453"), but in 1987, the case color was changed to the long-lived, warm gray "Platinum" color. It is the earliest Macintosh model able to run System 7 OS.
1 Overview 2 Long production life 3 Problems
3.1 ROM revisions
4 Emulators 5 Timeline of compact Macintosh models 6 References 7 External links
Overview Bruce Webster of BYTE reported a rumor in December 1985: "Supposedly, Apple will be releasing a Big Mac by the time this column sees print: said Mac will reportedly come with 1 megabyte of RAM ... the new 128K-byte ROM ... and a double-sided (800K bytes) disk drive, all in the standard Mac box". Introduced as the Macintosh Plus, it was the first Macintosh model to include a SCSI port, which launched the popularity of external SCSI devices for Macs, including hard disks, tape drives, CD-ROM drives, printers, and even monitors. The SCSI implementation of the Plus was engineered shortly before the initial SCSI spec was finalized and, as such, is not 100% SCSI-compliant. SCSI ports remained standard equipment for all Macs until the introduction of the iMac in 1998, which replaced most of Apple's "legacy ports" with USB. The Macintosh Plus was the last classic Mac to have a phone cord-like port on the front of the unit for the keyboard, as well as the DE-9 connector for the mouse; models released after the Macintosh Plus would use ADB ports. The Mac Plus was the first Apple computer to utilize SIMM memory instead of single DIP DRAMs. Four slots were provided and the computer shipped with four 256k SIMMs for 1MB total. By replacing them with 1MB SIMMs, it was possible to have 4MB of RAM. Although 30-pin SIMMs could support up to 16MB total RAM, the motherboard had only 22 address lines connected for 4MB. It has what was then a new 3.5-inch double-sided 800 KB floppy drive, offering double the capacity of floppy disks for previous Macs, along with backward compatibility. The then-new drive is controlled by the same IWM chip as in previous models, implementing variable speed GCR. The drive was still completely incompatible with PC drives. The 800 KB drive has two read/write heads, enabling it to simultaneously use both sides of the floppy disk and thereby double storage capacity. Like the 400 KB drive before it, a companion Macintosh 800K External Drive was an available option. However, with the increased storage capacity combined with 2-4x the available RAM, the external drive was less of a necessity than it had been with the 128K and 512K. The Mac Plus has 128 KB of ROM on the motherboard, which is double the amount of ROM that's in previous Macs; the then-new System software and ROMs included routines to support SCSI, the then-new 800 KB floppy drive, and the Hierarchical File System (HFS), which uses a true directory structure on disks (as opposed to the earlier MFS, Macintosh File System in which all files were stored in a single directory, with one level of pseudo-folders overlaid on them). For programmers, the fourth Inside Macintosh volume details how to use HFS and the rest of the Mac Plus's new system software. This new filing system allows it to use the first hard drive Apple developed for the 512K, the IWM floppy disk-based Hard Disk 20 and the then-new ROMs allow the Macintosh to use the drive as a startup disk for the first time. The Plus still did not include provision for an internal hard drive and it would be over nine months before Apple would offer a SCSI drive replacement for the slow Hard Disk 20. It would be well over a year before Apple would offer the first internal hard disk drive in any Macintosh. A compact Mac, the Plus has a 9-inch (23 cm) 512×342 pixel monochrome display with a resolution of 72 PPI, identical to that of previous Macintosh models. Unlike earlier Macs, the Mac Plus's keyboard includes a numeric keypad and directional arrow keys and, as with previous Macs, it has a one-button mouse and no fan, making it extremely quiet in operation. The lack of a cooling fan in the Mac Plus led to frequent problems with overheating and hardware malfunctions. The applications MacPaint and MacWrite were bundled with the Mac Plus. After August 1987, HyperCard and MultiFinder were also bundled. Third-party software applications available included MacDraw, Microsoft Word, Excel, and PowerPoint, as well as Aldus's PageMaker. Microsoft Excel and PowerPoint (originally by Forethought) were actually developed and released first for the Macintosh, and similarly Microsoft Word 1 for Macintosh was the first time a GUI version of that software was introduced on any personal computer platform. For a time, the exclusive availability of Excel and PageMaker on the Macintosh were noticeable drivers of sales for the platform.
The Apple Macintosh Plus at the Design Museum in Gothenburg, Sweden
The case design is essentially identical to the original Macintosh. It debuted in beige and was labeled Macintosh Plus on the front, but Macintosh Plus 1 MB on the back, to denote the 1 MB RAM configuration with which it shipped. In January 1987 it transitioned to Apple's long-lived platinum-gray color with the rest of the Apple product line, and the keyboard's keycaps changed from brown to gray. In January 1988, with reduced RAM prices, Apple began shipping 2- and 4- MB configurations and rebranded it simply as "Macintosh Plus." Among other design changes, it included the same trademarked inlaid Apple logo and recessed port icons as the Apple IIc and IIGS before it, but it essentially retained the original design. An upgrade kit was offered for the earlier Macintosh 128K and Macintosh 512K/enhanced, which includes a new motherboard, floppy disk drive and rear case. The owner retained the front case, monitor, and analog board. Because of this, there is no "Macintosh Plus" on the front of upgraded units, and the Apple logo is recessed and in the bottom left hand corner of the front case. However, the label on the back of the case reads "Macintosh Plus 1MB". The new extended Plus keyboard could also be purchased. Unfortunately, this upgrade cost almost as much as a new machine. The Mac Plus itself can be upgraded further with the use of third-party accelerators. When these are clipped or soldered onto the 68000 processor, a 32 MHz 68030 processor can be used, and up to 16 MB RAM. This allows it to run Mac OS 7.6.1. There is a program available called Mini vMac that can emulate a Mac Plus on a variety of platforms, including Unix, Windows, DOS, classic Mac OS, macOS, Pocket PC, iOS and even Nintendo DS. Long production life
The "ED" at the end of the model name indicates that this Macintosh was sold to the educational market.
Although the Mac Plus would become overshadowed by two new Macs (the Macintosh SE and the Macintosh II) in March 1987, it remained in production as a cheaper alternative until the introduction of the Macintosh Classic on October 15, 1990. This makes the Macintosh Plus the longest-produced Macintosh ever. It continued to be supported by versions of the classic Mac OS up to version 7.5.5, released in 1996. Additionally, during its period of general market relevance, it was heavily discounted like the 512K/512Ke before it and offered to the educational market badged as the "Macintosh Plus ED". Due to its popularity, long life and its introduction of many features that would become mainstays of the Macintosh platform for years, the Plus was a common "base model" for many software and hardware products. Problems The lack of fan could cause the life of a Macintosh Plus to end early for some users. As the power supply would heat up, solder joints inside it would fracture causing many problems, such as loss of deflection in the monitor or a complete loss of power. As in most early compact Macs, the problem was common in the yoke connector, flyback transformer, and horizontal drive coupling capacitor. A fan was also often added to reduce heat when the machine was upgraded to its full RAM capacity of 4 MB. From the debut of the Macintosh 128K through the Macintosh Plus, various third-party cooling add-ons were available to help increase airflow through the unit. Apple reorganized the compact Macintosh case to accommodate a fan with the release of the Macintosh SE, which included a heat-generating internal hard disk. ROM revisions The Plus went through two ROM revisions during its general market relevance. The initial ROM was replaced after the first two months as it had a serious bug which prevented the Mac from booting if an external SCSI device was powered off. The second revision fixed a problem with some SCSI devices that could send the Mac into an endless reset at startup. Emulators
MESS Mini vMac
Timeline of compact Macintosh models See also: Timeline of Macintosh models
^ "The 25 Greatest PCs of All Time". PCWorld. 2006-08-11. Retrieved 2016-05-20. ^ "History of computer design: Apple Macintosh". Landsnail.com. 1998-05-17. Retrieved 2016-05-20. ^ "History of computer design: Macintosh Plus". Landsnail.com. 1998-05-17. Retrieved 2016-05-20. ^ Webster, Bruce (December 1985). "Microcomputer Color Graphics-Observations". BYTE. p. 405. Retrieved 28 October 2013. ^ Knight, Dan. "ScuzzyGraph and ScuzzyGraph II". Low End Mac. Retrieved 10 July 2015. ^ "Mac Plus". Low End Mac. Retrieved 2016-05-20. ^  ^ "Classic Mac Repair Notes" (PDF). 68kmla.org. Retrieved 2016-05-20. ^ Still Useful after All These Years -- The Mac Plus ^ "Technical Notes". Developer.apple.com. Retrieved 2016-05-20. ^ "Technical Notes". Developer.apple.com. Retrieved 2016-05-20.
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Macintosh Plus technical specifications at apple.com BYTE takes an early look at the Mac Plus
v t e
Apple hardware before 1998
Apple I Apple II series
II II Plus IIe IIc IIc Plus IIGS
128K 512K 512Ke Plus SE SE/30 Classic Classic II Color Classic
II IIx IIcx IIci IIfx IIsi IIvi IIvx
LC LC II LC III LC 475 LC 500 series LC 630 5200 LC Macintosh TV
700 900 950 800 840AV 600 series
610 650 660AV 605 630
Macintosh Portable 68k-based PowerBooks
100 140 170 160 180 150 190
2300c 5300 1400 3400c 2400c
4400 and 7220 5000 series
5200 LC and 5300 LC 5260 5400 5500
6100 6200 and 6300 6400 6500
7100 7200 and 8200 7300 7500 7600
8100 8500 8600
Power Macintosh G3
Apple Lisa Macintosh XL Macintosh Performa Macintosh Centris Apple IIe Card (Macintosh PDS) Apple Workgroup Server
Apple Network Server Twentieth Anniversary Macintosh
Monitor III Monitor II AppleColor Composite IIe AppleColor High-Resolution RGB Macintosh Color AudioVision 14 Multiple Scan 14 ColorSync 750
Disk II Macintosh ProFile Hard Disk 20 Hard Disk 20SC AppleCD PowerCD Tape Drive 40SC
Keyboard Desktop Bus Extended Keyboard Adjustable Keyboard Mouse Scanner QuickTake
Apple II serial cards Apple Modem LocalTalk Apple Communication Slot GeoPort
Silentype Dot Matrix Printer Letter Quality Printer ImageWriter LaserWriter 410 Color Plotter Color LaserWriter StyleWriter
MessagePad eMate 300
Paladin Interactive Television Box Pippin