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All-in-One · 1990ObsoleteRare · 65
Macintosh Classic
M0420 · Platinum
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Identifiers
| Order number | M0420 |
Reference
| Original price | $999 |
| Announced | 1990-10-15 |
| Discontinued | 1992-09-14 |
| Max supported OS | System 7.5.5 |
| Design era | Platinum |
Configurations
| Colors | Platinum |
| CPU | Motorola 68000 @ 8 MHz |
| Memory | 1 MB, 2 MB, 4 MB |
| Storage | 40 MB SCSI HDD, 1.44 MB SuperDrive, BlueSCSI |
| Graphics | Built-in framebuffer (1-bit) |
| Display | 9″ monochrome CRT (built-in, 512×342) |
| Operating system | System 6.0, System 6.0.1, System 6.0.2, System 6.0.3, System 6.0.4, System 6.0.5, System 6.0.7, System 6.0.8, System 7.0, System 7.0.1, System 7.1, System 7.1.1, System 7.1.2, System 7.5, System 7.5.1, System 7.5.2, System 7.5.3, System 7.5.5 |
| Removable media | 1.4 MB floppy (FDHD) |
Physical
| Ports & connectivity | ADB (2) · DB-25 SCSI · 2× RS-422 Mini-DIN-8 serial · 3.5mm audio out |
| Dimensions (W×H×D) | 245 × 345 × 277 mm |
| Weight | 7.3 kg |
Known quirks
- PRAM battery leak can destroy logic board — common on 30+ year old units
- Analog board caps and flyback fail — recap job typical before reliable use
- No PDS slot — not expandable beyond RAM and HDD
- Underpowered 68000 at 8 MHz — slower than 1986's Mac Plus in some tasks