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Commodore 4040

 
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Commodore 4040
 
 
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The Commodore 4040 and its sibling(s), the 2040 and the European marketed 3040, were dual unit 5¼" floppy disk
Floppy disk

A floppy disk is a data storage medium that is composed of a disk of thin, flexible magnetic storage medium encased in a square or rectangle plastic shell....
 drives for Commodore International
Commodore International

Commodore, the commonly used name for Commodore International, was a United States electronics company based in West Chester, Pennsylvania which was a vital player in the home computer/personal computer field in the 1980s....
 computers. They used a wide case form, and used the IEEE-488
IEEE-488

IEEE-488 is a short-range, digital communications computer bus specification that has been in use for over 30 years. Originally created for use with automated test equipment, the standard is still in wide use for that purpose....
 interface common to Commodore PET/CBM
Commodore PET

The PET was a home computer-/personal computer produced by Commodore International starting in 1977. Although it was not a top seller outside the Canadian, US, and UK educational markets, it was Commodore's first full-featured computer and would form the basis for their future success....
 computers.

These drive models used a similar single density, single side floppy data storage format to that used by the Commodore 1541
Commodore 1541

The Commodore 1541 , made by Commodore International, was the best-known floppy disk drive for the Commodore 64 home computer. The 1541 was a single-sided 170 kilobyte drive for 5?" disks....
 drive, but with a slightly different data marker indicating which model originally formatted the disk.






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Commodore4040
The Commodore 4040 and its sibling(s), the 2040 and the European marketed 3040, were dual unit 5¼" floppy disk
Floppy disk

A floppy disk is a data storage medium that is composed of a disk of thin, flexible magnetic storage medium encased in a square or rectangle plastic shell....
 drives for Commodore International
Commodore International

Commodore, the commonly used name for Commodore International, was a United States electronics company based in West Chester, Pennsylvania which was a vital player in the home computer/personal computer field in the 1980s....
 computers. They used a wide case form, and used the IEEE-488
IEEE-488

IEEE-488 is a short-range, digital communications computer bus specification that has been in use for over 30 years. Originally created for use with automated test equipment, the standard is still in wide use for that purpose....
 interface common to Commodore PET/CBM
Commodore PET

The PET was a home computer-/personal computer produced by Commodore International starting in 1977. Although it was not a top seller outside the Canadian, US, and UK educational markets, it was Commodore's first full-featured computer and would form the basis for their future success....
 computers.

These drive models used a similar single density, single side floppy data storage format to that used by the Commodore 1541
Commodore 1541

The Commodore 1541 , made by Commodore International, was the best-known floppy disk drive for the Commodore 64 home computer. The 1541 was a single-sided 170 kilobyte drive for 5?" disks....
 drive, but with a slightly different data marker indicating which model originally formatted the disk. The low level disk format was similar enough to allow reading between models, but different enough that one series of drive models could not reliably write to disks formatted with one of the other model series.