Macintosh Classic II
The Macintosh Classic II, released in 1991, was the final compact black-and-white Macintosh to use the classic all-in-one design. Unlike its predecessor, it utilized the more advanced Motorola 68030 processor—similar to the SE/30—but without the PDS expansion slot or 32-bit clean ROM. It came with 2 MB of RAM standard and supported up to 10 MB via a single 100 ns 30-pin SIMM. The Classic II retained the 9-inch monochrome display, making it ideal for schools and business use, but with improved performance and more modern architecture.
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| Macintosh Classic II | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Personal Computer |
| Released | October 21, 1991 |
| Discontinued | September 13, 1993 |
| Intro price | US$1,900 |
| CPU | Motorola 68030 @ 16 MHz |
| Memory | 2 MB RAM (expandable to 10 MB) |
| Storage | 1.44 MB 3.5" floppy drive, optional 40–80 MB SCSI hard drive |
| Display | 9" monochrome CRT (512×342 pixels) |
| Sound | Monaural 8-bit, 22 kHz |
| Dimensions | 13.2" H × 9.6" W × 10.9" D |
| Weight | 16.5 lbs (7.5 kg) |
| OS / Firmware | System 6.0.8L – System 7.6.1 |
| Predecessor | Macintosh Classic |
| Successor | Macintosh Color Classic |
| Codename | Performa, Stardust, Apollo |
| Model no. | M0420, M4150 |
General Maintenance
Due to the similarities witth the Macintosh Classic, for details on disassembly, cleaning, voltage regulation, PRAM battery handling, and corrosion prevention, refer to the Macintosh Classic / Classic II General Maintenance page.
PCB Schematics & Service Manual
The Classic II consists of a logic board and analog board, similar in layout to the Macintosh SE/30 but with different ICs and no expansion slot. The analog board for the Classic II is identical to the Macintosh Classic. However, the logic board in the Classic II has a complete redesign.
Apple Service Manual
The complete Apple Service Manual archive is available at the Apple Service Manuals page. For the Classic II, you can download the service guide here: File:Macintosh Classic - Classic II.pdf
Logic Board & Analog Board Schematics
| Logic Board | Analog Board |
|---|---|
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Capacitor Replacement Guide
The Classic II is prone to logic board failure due to surface-mount capacitor leakage. For safe replacement procedures, refer to the Macintosh Classic II Capacitor Replacement Guide.
Retrobrite
For plastic restoration and case whitening instructions, visit the Retrobrite page.
Troubleshooting
A complete guide to common issues including no chime, no video, checkerboard pattern, logic board failure, and hard drive detection issues is available at the Macintosh Classic / Classic II Troubleshooting page.