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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 – $1,499 |
| 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 6.0.7, System 7.0, 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