Commodore 1551
The Commodore 1551 (originally introduced as the SFS 481) is a floppy disk drive for the Commodore Plus/4 home computer. It resembles a charcoal-colored Commodore 1541 and plugs into the cartridge port, providing faster access than the C64/1541 combination. Commodore reportedly planned an interface to allow use of the 1551 with the C64, but it was never released.
View of a European Commodore 1551 disk drive, showing the connector | |
| Codename | SFS481 |
|---|---|
| Manufacturer | Commodore Business Machines, Inc. |
| Product family | Commodore 264 series |
| Type | Floppy drive |
| Release date | 1984 |
| Introductory price | US$400 (1984) equivalent to $1,100 in 2022 |
| Discontinued | 1986 |
| Media | 5.25" floppy disk Single Sided, Single Density |
| Operating system | CBM DOS 2.6 |
| CPU | MOS 6510T: 86 |
| Memory |
|
| Storage | 170 kB: 86 |
| Connectivity | TED parallel port |
| Dimensions | 97 mm × 200 mm × 374 mm 3.8 in × 7.9 in × 14.7 in: 86 |
| Mass | 10.5 kg 23 lb: 86 |
| Backward compatibility | |
| Predecessor | Commodore 1541 |
| Successor | |
Aside from faster access, the drive is very similar to the 1541. Like the 1541, it is a single-sided 170-kilobyte drive for 5¼" disks, with each disk split into 664 256-byte blocks available for user data plus 19 blocks for DOS data and directory; the file system makes each block its own cluster.: 86
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