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| {| class="wikitable" style="float: right; margin-left: 10px; width: 300px;" | | {{Infobox computer |
| |+ style="font-size: larger;" | Macintosh Plus | | | name = Macintosh 128K |
| |- | | | image = [[File:Macintosh128K.jpg|250px]] |
| | colspan="2" style="text-align:center;" | [[File:MacintoshPlus.jpg|250px]]
| | | manufacturer = Apple Computer, Inc. |
| |- | | | type = Personal Computer |
| |'''Manufacturer''' || Apple Computer, Inc.
| | | release date = January 24, 1984 |
| |- | | | discontinued = October 1, 1985 |
| |'''Type''' || Personal Computer
| | | price = US$2,495 |
| |- | | | cpu = Motorola 68000 @ 7.83 MHz |
| |'''Release Date''' || January 16, 1986
| | | memory = 128 KB RAM (not expandable) |
| |- | | | storage = 400 KB 3.5" floppy drive |
| |'''Discontinued''' || October 15, 1990
| | | display = 9" monochrome CRT (512×342 pixels) |
| |- | | | sound = Monaural 8-bit, 22 kHz (4-voice) |
| |'''Introductory Price''' || US$2,599
| | | dimensions = 13.6" H × 9.6" W × 10.9" D |
| |- | | | weight = 16.5 lbs (7.5 kg) |
| |'''CPU''' || Motorola 68000 @ 8 MHz
| | | os = System 1.0 – System 3.2 |
| |- | | | predecessor = None |
| |'''Memory''' || 1 MB RAM (expandable to 4 MB)
| | | successor = [[Macintosh 512K]] |
| |- | | | codename = Annie, Mac, Twiggy Mac |
| |'''Storage''' || 800 KB 3.5" floppy drive, External SCSI
| | | model = M0001 |
| |- | | }} |
| |'''Display''' || 9" monochrome CRT (512×342 pixels)
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| |- | |
| |'''Sound''' || Monaural 8-bit, 22 kHz (4-voice)
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| |- | |
| |'''Dimensions''' || 13.6" H × 9.6" W × 10.9" D
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| |- | |
| |'''Weight''' || 16.5 lbs (7.5 kg)
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| |- | |
| |'''OS''' || System 3.0 – System 7.5.5
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| |- | |
| |'''Predecessor''' || [[Macintosh 512K]] | |
| |- | |
| |'''Successor''' || [[Macintosh SE]]
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| |-
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| |'''Codename''' || Mr. T
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| |-
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| |'''Model''' || M0001A
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| |}
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| == Historical Background ==
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| The '''Macintosh Plus''' was the third model in Apple’s Macintosh line, introduced on January 16, 1986. It shipped with 1 MB of RAM (expandable to 4 MB) and introduced an external SCSI port, significantly improving over the [[Macintosh 512K]]. Initially beige-colored (Pantone 453), the case became platinum gray in 1987. The Plus could run up to System 7.5.5, introduced SIMM memory modules, and featured an 800 KB floppy drive.
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| == General Maintenance ==
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| For detailed general maintenance practices including cleaning, PRAM battery handling, connector corrosion prevention, and voltage adjustments, please see the dedicated [[Macintosh Plus General Maintenance]] page.
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| == PCB Schematics & Service Manual ==
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| The Macintosh Plus features two main PCBs: the **Logic Board** and **Analog Board**. Below are detailed schematics and the official Apple service manual for the Macintosh Plus.
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| === Apple Service Manual ===
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| [[File:Macintosh Plus.pdf|center|thumb|Apple Service Guide - Macintosh Plus]]
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| === Logic Board & Analog Board Schematics ===
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| {| class="wikitable" style="width:50%; text-align:center;"
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| |+'''Macintosh Plus PCB Schematics'''
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| |-
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| ! style="background-color:#f2f2f2; width:30%;"| Logic Board
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| ! style="background-color:#f2f2f2; width:30%;"| Analog Board
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| |-
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| | [[File:MacintoshPlus_LogicBoard.jpg|thumb|center|250px|Macintosh Plus Logic Board]]
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| [[File:MacintoshPlus_LogicBoard_Shematic.jpg|thumb|center|250px|Macintosh Plus Logic Board Schematic]]
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| | [[File:MacintoshPlus_AnalogBoard.jpg|thumb|center|250px|Analog Board]]
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| [[File:MacintoshPlus_AnalogBoard_Schematic.jpg|thumb|center|250px|Analog Board Schematic]]
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| |}
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