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| caption      = Macintosh Classic
| caption      = Macintosh Classic
| manufacturer = Apple Computer, Inc.
| manufacturer = Apple Computer, Inc.
| type        = Personal Computer
| type        = Personal computer
| release date = October 15, 1990
| release_date = 15 October 1990
| discontinued = September 14, 1992
| discontinued = 14 September 1992
| price        = US$999 – $1,499
| price        = US$999 (floppy only) – US$1,499 (40 MB hard disk, 2 MB RAM)
| cpu          = Motorola 68000 @ 8 MHz
| cpu          = Motorola 68000 @ 7.8336 MHz
| memory      = 1 MB RAM (expandable to 4 MB)
| memory      = 1 MB soldered, expandable to 4 MB with Apple's memory expansion board
| storage      = 1.44 MB 3.5" floppy drive, optional 40 MB SCSI hard drive
| rom          = 512 KB
| display      = 9" monochrome CRT (512×342 pixels)
| storage      = Internal 1.4 MB floppy drive; optional internal 40 MB SCSI hard disk
| sound        = Monaural 8-bit, 22 kHz
| display      = 9-inch monochrome CRT, 512 × 342 pixels
| dimensions  = 13.2" H × 9.6" W × 10.9" D
| sound        = Four-voice, 8-bit D/A conversion, 22 kHz sampling
| weight      = 16.5 lbs (7.5 kg)
| ports        = 1 × ADB (mini-DIN-4); DB-19 external floppy; DB-25 SCSI; 2 × RS-422 serial (mini-DIN-8); headphone
| power        = 100–120 V AC, 47–63 Hz, 100 W maximum
| dimensions  = 13.2 in H × 9.7 in W × 11.2 in D (33.6 × 24.6 × 28.5 cm)
| weight      = 16–17.1 lb (7.3–7.8 kg) without a hard disk
| os          = System 6.0.7 – System 7.5.5
| os          = System 6.0.7 – System 7.5.5
| predecessor  = [[Macintosh SE]]
| predecessor  = [[Macintosh SE]]
| successor    = [[Macintosh Classic II]]
| successor    = [[Macintosh Classic II]]
| codename    = Elsie, Skywriter
| codename    = XO, Civic
| model        = M0420
| model        = M0420
}}
}}
The '''Macintosh Classic''' was introduced by Apple on October 15, 1990, as a low-cost alternative in the Macintosh lineup and a spiritual successor to the original Macintosh 128K and SE. It retained the same 9-inch monochrome display and compact form factor, but included a 1.44 MB SuperDrive and optional internal SCSI hard drive. It was the first Macintosh to sell for under $1,000, making it a popular choice for schools and home users.
The '''Macintosh Classic''', introduced on 15 October 1990, was the first Macintosh to sell for under US$1,000. It is a cost-reduced compact: the same 68000 at 7.8336 MHz as the [[Macintosh SE]], a 1.4 MB floppy drive, an optional 40 MB hard disk, and — unlike the SE — '''no expansion slot and only one ADB port'''.<ref name="sscl">Apple Computer, ''Macintosh Classic/Classic II/Performa 200 Service Source'' — Specifications, Troubleshooting, Upgrades, Adjustments and Additional Procedures chapters. Hosted on this wiki: [[:File:Classic ii.performa 200.pdf]].</ref><ref name="lem">Low End Mac, ''Mac Classic'' tech specs (secondary source, used for dates, prices, codenames and the ROM disk).</ref>


== General Maintenance ==
== Specifications ==
For cleaning, battery maintenance, board inspection, and power supply tuning, refer to the [[Macintosh Classic General Maintenance]] page.


== PCB Schematics & Service Manual ==
Apple's own specification pages for this family.<ref name="sscl" />


The Macintosh Classic includes two main PCBs: a unified logic board and an analog board. Below are the schematics and Apple’s official service manual.
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:85%;"
! Item !! Specification
|-
| CPU || Motorola 68000, 7.8336 MHz, 32-bit internal data bus, 256-byte instruction and data caches
|-
| RAM || 1 MB, expandable to 4 MB (120 ns or faster SIMMs)
|-
| ROM || 512 KB
|-
| PRAM || 256 bytes
|-
| Expansion connector || 44-pin connector for the optional memory expansion board, which itself carries two SIMM connectors
|-
| Floppy || Internal 1.4 MB; optional external 800 KB or 1.4 MB
|-
| Hard disk || Optional internal 40 MB; external SCSI supported
|-
| ADB || '''One''' port, mini-DIN-4
|-
| Serial || Two RS-422 ports, mini-DIN-8
|-
| Sound || Four-voice, 8-bit D/A conversion, 22 kHz sampling. The Classic does not provide true two-channel output, although a stereo jack may be used
|-
| Video || 9-inch diagonal, 512 × 342 bit-mapped monochrome
|-
| Line voltage || 100–120 V AC
|-
| Frequency || 47–63 Hz, single phase
|-
| Maximum power || 100 W
|-
| Dimensions || 13.2 × 9.7 × 11.2 in (33.6 × 24.6 × 28.5 cm)
|-
| Weight || 16–17.1 lb (7.3–7.8 kg), excluding an internal hard disk
|}
 
== Memory ==
 
There are no SIMM sockets on the Classic's logic board. The 1 MB on board is soldered, and expansion happens on Apple's optional memory expansion board: 1 MB soldered plus a pair of 30-pin SIMM sockets and a configuration jumper, giving 2 MB, 2.5 MB or 4 MB.<ref name="sscl" />
 
Two rules from Apple that cause most of the trouble:
* the jumper must match what is fitted — "SIMMs" or "No SIMMs";
* on a 4 MB machine the modules must be '''eight-chip''' SIMMs. Apple states that 1 MB SIMMs with fewer than eight chips will not work in the Macintosh Classic.<ref name="sscl" />
 
Full procedure: [[Macintosh Classic Memory Upgrade Guide]].
 
== The ROM disk ==
 
The Classic is the only Macintosh that can boot from its own ROM. Holding '''Command-Option-X-O''' at startup mounts a 357 KB read-only volume named "Boot Disk" containing System 6.0.3 and Finder 6.1.x — a reference to the machine's XO codename. It is genuinely useful for diagnosis: a Classic that will not boot from a disk but does boot from ROM has a working logic board, ROM, RAM and video.<ref name="lem" /><ref name="eeggs">The Macintosh Easter Egg List and Low End Mac both document the Command-Option-X-O ROM disk, its contents and its 357 KB size (secondary sources).</ref>
 
== Service manual and schematics ==
 
=== Apple service manual ===
<pdf width="800" height="500">File:Macintosh_Classic_-_Classic_II.pdf</pdf>
 
 
The embedded file is Apple's ''Macintosh Classic/Classic II/Performa 200'' ''Service Source''. Two copies are hosted here: [[Macintosh Classic/ Classic II/Performa 200 Service Source]] (115 pages) and [[Macintosh Classic / Classic II Service Source]] (113 pages, the copy embedded above). They are the same manual; the longer copy's '''Light Meter Setup''' topic covers three meter models (R77, L-248 and 246) where the shorter covers two.
 
Two things the manual settles for this machine: the PRAM cell is '''lithium and is replaced below 3.0 V''', measured with the logic board out and the CRT discharged;<ref name="ssclassicbatt">''Macintosh Classic/Classic II/Performa 200'', Apple ''Service Source'', Additional Procedures, Battery Verification - hosted on this wiki as [[Macintosh Classic/ Classic II/Performa 200 Service Source]]. "If the battery voltage is below 3.0 volts, replace the battery." The procedure's "before you begin" is remove the cover, discharge the CRT, remove the logic board.</ref> and there is '''no power-supply voltage adjustment''' for this family - Apple's Adjustments chapter is light-meter setup, video and yoke only, so the rail-tolerance figures published for the Macintosh 128K, 512K and Plus do not apply here.


=== Apple Service Manual ===
All the Apple service manuals are on the [[:Category:Apple Service Source|Apple Service Source]] page.
All Apple Service Manuals are archived on the [[Apple Service Manuals]] page. You can find the Classic Service Manual here: [[File:Macintosh Classic.pdf|center|thumb|Apple Service Guide - Macintosh Classic]]


=== Logic Board & Analog Board Schematics ===
=== Logic board and analogue board ===


{| class="wikitable" style="width:50%; text-align:center;"
{| class="wikitable" style="width:50%; text-align:center;"
|+'''Macintosh Classic PCB Schematics'''
|+'''Macintosh Classic PCB images'''
|-
|-
! style="background-color:#f2f2f2; width:30%;"| Logic Board
! style="background-color:#f2f2f2; width:30%;"| Logic board
! style="background-color:#f2f2f2; width:30%;"| Analog Board
! style="background-color:#f2f2f2; width:30%;"| Analogue board
|-
|-
| [[File:MacintoshClassicLogicBoard.jpg|thumb|center|250px|Macintosh Classic Logic Board]][[File:MacintoshClassic LogicBoard Schematic.pdf|center|thumb|Macintosh Classic Logic Board Schematic]]
| [[File:MacintoshClassicLogicBoard.jpg|thumb|center|250px|Macintosh Classic logic board]][[File:MacintoshClassic LogicBoard Schematic.pdf|center|thumb|Macintosh Classic logic board schematic]]
| [[File:MacintoshClassic AnalogBoard.png|center|thumb|250x250px|Macintosh Classic Analog Board]][[File:Classic Analog Board Schematic.pdf|center|thumb|Macintosh Classic Analog Board Schematic]]
| [[File:MacintoshClassic AnalogBoard.jpg|center|thumb|250x250px|Macintosh Classic analogue board]][[File:Classic Analog Board Schematic.pdf|center|thumb|Macintosh Classic analogue board schematic]]
|}
|}


== Capacitor Replacement Guide ==
== Maintenance, capacitors and troubleshooting ==
Full details on logic and analog board recapping can be found at the [[Macintosh Classic Capacitor Replacement Guide]].
 
* '''[[Macintosh Classic / Classic II General Maintenance]]''' — cleaning, the 3.6 V lithium cell and its 3.0 V replacement threshold, and what Apple does and does not publish about the rails.
* '''[[Macintosh Classic Capacitor Replacement Guide]]''' — values and positions.
* '''[[Macintosh Classic / Classic II Troubleshooting]]''' — symptom-led diagnosis.
* '''[[CRT Discharge Procedure]]''' — read before opening the case.
* '''[[Retrobrite]]''' — for the yellowed case.
 
'''Apple publishes no rail tolerance and no power-supply adjustment for this machine.''' Its Adjustments chapter is video and yoke work only — light meter setup, cutoff, brightness and contrast, centring, size, focus.<ref name="sscl" /> Note also that ''The Dead Mac Scrolls'', the standard component-level reference for the earlier compacts, explicitly does not cover the Classic.<ref name="dms">Larry Pina, ''The Dead Mac Scrolls'', Peachpit Press, 1992, introduction. Hosted on this wiki: [[:File:The Dead Mac Scrolls 1992.pdf]].</ref>
 
Sad Mac codes are decoded on [[Sad Mac Error Codes]] and with the [[Sad Mac Decoder]].


== Retrobrite ==
== Related pages ==
To restore the beige color of the Classic’s case, refer to the safe plastic whitening procedures outlined on the [[Retrobrite]] page.
* [[Macintosh SE]] and [[Macintosh SE/30]]
* [[Macintosh Classic II]]
* [[Macintosh Color Classic]]


== Troubleshooting ==
== References ==
For diagnosis and solutions to common issues including no startup, checkerboard patterns, floppy drive problems, and failed PRAM batteries, see the [[Macintosh Classic Troubleshooting]] guide.
<references />


[[Category:Apple Vintage Computers]]
[[Category:Apple Vintage Computers]]
{{Navbox-AppleVintage|state=collapsed}}

Latest revision as of 08:01, 25 September 2026

Macintosh Classic
Macintosh Classic
Specifications
ManufacturerApple Computer, Inc.
TypePersonal computer
Released15 October 1990
Discontinued14 September 1992
Intro priceUS$999 (floppy only) – US$1,499 (40 MB hard disk, 2 MB RAM)
CPUMotorola 68000 @ 7.8336 MHz
Memory1 MB soldered, expandable to 4 MB with Apple's memory expansion board
StorageInternal 1.4 MB floppy drive; optional internal 40 MB SCSI hard disk
Display9-inch monochrome CRT, 512 × 342 pixels
SoundFour-voice, 8-bit D/A conversion, 22 kHz sampling
ROM512 KB
Ports / interface1 × ADB (mini-DIN-4); DB-19 external floppy; DB-25 SCSI; 2 × RS-422 serial (mini-DIN-8); headphone
Power100–120 V AC, 47–63 Hz, 100 W maximum
Dimensions13.2 in H × 9.7 in W × 11.2 in D (33.6 × 24.6 × 28.5 cm)
Weight16–17.1 lb (7.3–7.8 kg) without a hard disk
OS / FirmwareSystem 6.0.7 – System 7.5.5
PredecessorMacintosh SE
SuccessorMacintosh Classic II
CodenameXO, Civic
Model no.M0420

The Macintosh Classic, introduced on 15 October 1990, was the first Macintosh to sell for under US$1,000. It is a cost-reduced compact: the same 68000 at 7.8336 MHz as the Macintosh SE, a 1.4 MB floppy drive, an optional 40 MB hard disk, and — unlike the SE — no expansion slot and only one ADB port.[1][2]

Specifications

[edit | edit source]

Apple's own specification pages for this family.[1]

Item Specification
CPU Motorola 68000, 7.8336 MHz, 32-bit internal data bus, 256-byte instruction and data caches
RAM 1 MB, expandable to 4 MB (120 ns or faster SIMMs)
ROM 512 KB
PRAM 256 bytes
Expansion connector 44-pin connector for the optional memory expansion board, which itself carries two SIMM connectors
Floppy Internal 1.4 MB; optional external 800 KB or 1.4 MB
Hard disk Optional internal 40 MB; external SCSI supported
ADB One port, mini-DIN-4
Serial Two RS-422 ports, mini-DIN-8
Sound Four-voice, 8-bit D/A conversion, 22 kHz sampling. The Classic does not provide true two-channel output, although a stereo jack may be used
Video 9-inch diagonal, 512 × 342 bit-mapped monochrome
Line voltage 100–120 V AC
Frequency 47–63 Hz, single phase
Maximum power 100 W
Dimensions 13.2 × 9.7 × 11.2 in (33.6 × 24.6 × 28.5 cm)
Weight 16–17.1 lb (7.3–7.8 kg), excluding an internal hard disk

Memory

[edit | edit source]

There are no SIMM sockets on the Classic's logic board. The 1 MB on board is soldered, and expansion happens on Apple's optional memory expansion board: 1 MB soldered plus a pair of 30-pin SIMM sockets and a configuration jumper, giving 2 MB, 2.5 MB or 4 MB.[1]

Two rules from Apple that cause most of the trouble:

  • the jumper must match what is fitted — "SIMMs" or "No SIMMs";
  • on a 4 MB machine the modules must be eight-chip SIMMs. Apple states that 1 MB SIMMs with fewer than eight chips will not work in the Macintosh Classic.[1]

Full procedure: Macintosh Classic Memory Upgrade Guide.

The ROM disk

[edit | edit source]

The Classic is the only Macintosh that can boot from its own ROM. Holding Command-Option-X-O at startup mounts a 357 KB read-only volume named "Boot Disk" containing System 6.0.3 and Finder 6.1.x — a reference to the machine's XO codename. It is genuinely useful for diagnosis: a Classic that will not boot from a disk but does boot from ROM has a working logic board, ROM, RAM and video.[2][3]

Service manual and schematics

[edit | edit source]

Apple service manual

[edit | edit source]


The embedded file is Apple's Macintosh Classic/Classic II/Performa 200 Service Source. Two copies are hosted here: Macintosh Classic/ Classic II/Performa 200 Service Source (115 pages) and Macintosh Classic / Classic II Service Source (113 pages, the copy embedded above). They are the same manual; the longer copy's Light Meter Setup topic covers three meter models (R77, L-248 and 246) where the shorter covers two.

Two things the manual settles for this machine: the PRAM cell is lithium and is replaced below 3.0 V, measured with the logic board out and the CRT discharged;[4] and there is no power-supply voltage adjustment for this family - Apple's Adjustments chapter is light-meter setup, video and yoke only, so the rail-tolerance figures published for the Macintosh 128K, 512K and Plus do not apply here.

All the Apple service manuals are on the Apple Service Source page.

Logic board and analogue board

[edit | edit source]
Macintosh Classic PCB images
Logic board Analogue board
Macintosh Classic logic board
File:MacintoshClassic LogicBoard Schematic.pdf
Macintosh Classic analogue board
File:Classic Analog Board Schematic.pdf

Maintenance, capacitors and troubleshooting

[edit | edit source]

Apple publishes no rail tolerance and no power-supply adjustment for this machine. Its Adjustments chapter is video and yoke work only — light meter setup, cutoff, brightness and contrast, centring, size, focus.[1] Note also that The Dead Mac Scrolls, the standard component-level reference for the earlier compacts, explicitly does not cover the Classic.[5]

Sad Mac codes are decoded on Sad Mac Error Codes and with the Sad Mac Decoder.

[edit | edit source]

References

[edit | edit source]
  1. ↑ 1.0 1.1 1.2 1.3 1.4 Apple Computer, Macintosh Classic/Classic II/Performa 200 Service Source — Specifications, Troubleshooting, Upgrades, Adjustments and Additional Procedures chapters. Hosted on this wiki: File:Classic ii.performa 200.pdf.
  2. ↑ 2.0 2.1 Low End Mac, Mac Classic tech specs (secondary source, used for dates, prices, codenames and the ROM disk).
  3. ↑ The Macintosh Easter Egg List and Low End Mac both document the Command-Option-X-O ROM disk, its contents and its 357 KB size (secondary sources).
  4. ↑ Macintosh Classic/Classic II/Performa 200, Apple Service Source, Additional Procedures, Battery Verification - hosted on this wiki as Macintosh Classic/ Classic II/Performa 200 Service Source. "If the battery voltage is below 3.0 volts, replace the battery." The procedure's "before you begin" is remove the cover, discharge the CRT, remove the logic board.
  5. ↑ Larry Pina, The Dead Mac Scrolls, Peachpit Press, 1992, introduction. Hosted on this wiki: File:The Dead Mac Scrolls 1992.pdf.


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