Commodore 1551
External 5 1/4-inch floppy disk drive for the Commodore C-16 and Commodore Plus/4 homecomputers / From Wikipedia, the free encyclopedia
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.
Quick Facts Codename, Manufacturer ...
Codename | SFS481[1] |
---|---|
Manufacturer | Commodore Business Machines, Inc. |
Product family | Commodore 264 series |
Type | Floppy drive |
Release date | 1984; 40 years ago (1984)[2] |
Introductory price | US$400[2] (1984) equivalent to $1,200 in 2023 |
Discontinued | 1986[2] |
Media | 5.25" floppy disk Single Sided, Single Density[3] |
Operating system | CBM DOS 2.6[3] |
CPU | MOS 6510T[4]: 86 |
Memory | |
Storage | 170 kB[3][4]: 86 |
Connectivity | TED parallel port[3] |
Dimensions | 97 mm × 200 mm × 374 mm 3.8 in × 7.9 in × 14.7 in[4]: 86 |
Mass | 10.5 kg 23 lb[4]: 86 |
Backward compatibility | |
Predecessor | Commodore 1541 |
Successor |
Close
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.[4]: 86