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Encyclopedia > Commodore 1551

The Commodore 1551 was a floppy disk drive for the Commodore Plus/4 home computer. It resembled a charcoal-colored Commodore 1541 and plugged into the cartridge port, providing faster access than the C64/1541 combination.

Aside from faster access, the drive was very similar to the 1541. Like the 1541, it was a single-sided 166 kilobyte drive for 5" disks, with each disk split into 664 256-byte 'blocks'; the file system made each block its own cluster. Punching a second hole in the other side of the disk and flipping it over was a common practice.

The disk drive used Group Code Recording and contained a MOS Technology 6502 processor as a disk controller. The DOS limited the number of files per disk to 144 regardless of the number of free blocks on the disk because the directory was of a fixed size, and the file system did not allow for subdirectories.

Due to the Plus/4's poor sales in the United States, the 1551 is much less common than other Commodore disk drives. Also, due to its higher availability, many people opted to use 1541s with Plus/4s instead of the 1551, in spite of its greater speed. In Europe, the Plus/4 was much more successful, but because tape drives were the most popular storage device in Europe in the 1980s, the 1551 was not very popular in Europe either.

  Results from FactBites:
Commodore 1541 definition of Commodore 1541 in computing dictionary - by the Free Online Dictionary, Thesaurus and ... (190 words)
Commodore 1541 - The best know floppy disk drive for the Commodore 64.
The Commodore 1570 was an upgraded 1541 for use with the Commodore 128.
This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
  More results at FactBites »



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