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- Commodore_1581 abstract "The Commodore 1581 is a 3½-inch double-sided double-density floppy disk drive that was first made by Commodore Business Machines (CBM) in 1987, primarily for its C64 and C128 home/personal computers. The drive stores 800 kilobytes using an MFM encoding but format different from MS-DOS (720 kB), Amiga (880 kB), and Mac Plus (800 kB) formats. With special software it's possible to read C1581 disks on an x86 PC system, and likewise, read MS-DOS and other formats of disks in the C1581 (using Big Blue Reader), provided that the PC or other floppy handles the \"720 kB\" size format. This capability was most frequently used to read MS-DOS disks. The drive was released in the summer of 1987 and quickly became popular with bulletin board system (BBS) operators and other users.Like the 1541 and 1571, the 1581 has an onboard MOS Technology 6502 CPU with its own ROM and RAM, and uses a serial version of the IEEE-488 interface. Inexplicably, the drive's ROM contains commands for parallel use, although no parallel interface was available. Unlike the 1571, which is nearly 100% backward-compatible with the 1541, the 1581 has limited compatibility with Commodore's earlier drives. Although it responds to the same DOS commands, most disk utilities written prior to 1987—most notably fast loaders—are so 1541-specific that they do not work with the 1581.The version of Commodore DOS built into the 1581 added support for partitions, which could also function as fixed-allocation subdirectories. PC-style subdirectories were rejected as being too difficult to work with in terms of block availability maps, then still much in vogue, and which for some time had been the traditional way of inquiring into block availability. When used together with the C128, it implements faster burst mode access than the Commodore 1571 5¼\" drive. When using the 1581 together with the C64, however, it is almost as slow as the 1541 drive, due to limitations of the C64's ROM code. The 1581 provides a total of 3160 blocks free when formatted (a block being equal to 256 bytes). The number of permitted directory entries was also increased, to 296 entries. With a storage capacity of 800 kB, the 1581 is the highest-capacity serial-bus drive that was ever made by Commodore (the 1-MB SFD-1001 uses the parallel IEEE-488), and the only 3½\" one. However, starting in 1991, Creative Micro Designs (CMD) made the FD-2000 high density (1.6 MB) and FD-4000 extended density (3.2 MB) 3½\" drives, both of which offered not only a 1581-emulation mode but also 1541- and 1571-compatibility modes.Like the 1541 and 1571, a nearly identical job queue is available to the user in zero page (except for job 0), providing for exceptional degrees of compatibility.Unlike the cases of the 1541 and 1571, the low-level disk format used by the 1581 is similar enough to the MS-DOS format as the 1581 is built around a WD1770 FM/MFM floppy controller chip. PC floppy controllers directly connected via the ISA-bus or onboard, but not standalone USB floppy drives, are able to deal with the 1581 format without need for any special tricks. Thus, utilities to format, read, and write 1581-format disks in standard PC floppy drives under Linux and Microsoft Windows exist. This controller chip, however, was the seat of some early problems with 1581 drives when the first production runs were recalled due to a high failure rate; the problem was quickly corrected. Later versions of the 1581 drive have a smaller, more streamlined-looking external power supply provided with them.".
- Commodore_1581 thumbnail Commodore_1581_01.jpg?width=300.
- Commodore_1581 wikiPageExternalLink 1581-GAMES.htm.
- Commodore_1581 wikiPageExternalLink 1581-PC-35-DRIVE.htm.
- Commodore_1581 wikiPageExternalLink drive_info.txt.
- Commodore_1581 wikiPageExternalLink www.d81.de.
- Commodore_1581 wikiPageExternalLink index.html.
- Commodore_1581 wikiPageID "6769".
- Commodore_1581 wikiPageLength "6889".
- Commodore_1581 wikiPageOutDegree "48".
- Commodore_1581 wikiPageRevisionID "687123268".
- Commodore_1581 wikiPageWikiLink Amiga.
- Commodore_1581 wikiPageWikiLink Bulletin_board_system.
- Commodore_1581 wikiPageWikiLink Burst_mode_(computing).
- Commodore_1581 wikiPageWikiLink Byte.
- Commodore_1581 wikiPageWikiLink CMD_FD_series.
- Commodore_1581 wikiPageWikiLink Category:Commodore_64.
- Commodore_1581 wikiPageWikiLink Category:Products_introduced_in_1987.
- Commodore_1581 wikiPageWikiLink Commodore_128.
- Commodore_1581 wikiPageWikiLink Commodore_1541.
- Commodore_1581 wikiPageWikiLink Commodore_1571.
- Commodore_1581 wikiPageWikiLink Commodore_64.
- Commodore_1581 wikiPageWikiLink Commodore_DOS.
- Commodore_1581 wikiPageWikiLink Commodore_International.
- Commodore_1581 wikiPageWikiLink Creative_Micro_Designs.
- Commodore_1581 wikiPageWikiLink Directory_(computing).
- Commodore_1581 wikiPageWikiLink Disk_partitioning.
- Commodore_1581 wikiPageWikiLink Double-sided_disk.
- Commodore_1581 wikiPageWikiLink Double_density.
- Commodore_1581 wikiPageWikiLink Extended_density.
- Commodore_1581 wikiPageWikiLink Floppy_disk.
- Commodore_1581 wikiPageWikiLink Hertz.
- Commodore_1581 wikiPageWikiLink High-density_storage_media.
- Commodore_1581 wikiPageWikiLink Home_computer.
- Commodore_1581 wikiPageWikiLink IEEE-488.
- Commodore_1581 wikiPageWikiLink Job_queue.
- Commodore_1581 wikiPageWikiLink Kilobyte.
- Commodore_1581 wikiPageWikiLink Linux.
- Commodore_1581 wikiPageWikiLink MOS_Technology_6502.
- Commodore_1581 wikiPageWikiLink MS-DOS.
- Commodore_1581 wikiPageWikiLink Macintosh_Plus.
- Commodore_1581 wikiPageWikiLink Microsoft_Windows.
- Commodore_1581 wikiPageWikiLink Modified_Frequency_Modulation.
- Commodore_1581 wikiPageWikiLink Personal_computer.
- Commodore_1581 wikiPageWikiLink Volt-ampere.
- Commodore_1581 wikiPageWikiLink Western_Digital_FD1771.
- Commodore_1581 wikiPageWikiLink Zero_page.
- Commodore_1581 wikiPageWikiLink File:Commodore_1581_01.jpg.
- Commodore_1581 wikiPageWikiLinkText "1581".
- Commodore_1581 wikiPageWikiLinkText "C1581".
- Commodore_1581 wikiPageWikiLinkText "Commodore 1581".
- Commodore_1581 wikiPageUsesTemplate Template:Commodore_disk_drives.
- Commodore_1581 wikiPageUsesTemplate Template:FOLDOC.
- Commodore_1581 wikiPageUsesTemplate Template:Refimprove.
- Commodore_1581 subject Category:Commodore_64.
- Commodore_1581 subject Category:Products_introduced_in_1987.
- Commodore_1581 hypernym ½.
- Commodore_1581 type Place.
- Commodore_1581 type Computer.
- Commodore_1581 type Product.
- Commodore_1581 comment "The Commodore 1581 is a 3½-inch double-sided double-density floppy disk drive that was first made by Commodore Business Machines (CBM) in 1987, primarily for its C64 and C128 home/personal computers. The drive stores 800 kilobytes using an MFM encoding but format different from MS-DOS (720 kB), Amiga (880 kB), and Mac Plus (800 kB) formats.".
- Commodore_1581 label "Commodore 1581".
- Commodore_1581 sameAs Q337278.
- Commodore_1581 sameAs VC1581.
- Commodore_1581 sameAs Commodore_1581.
- Commodore_1581 sameAs m.01zf0.
- Commodore_1581 sameAs Commodore_1581.
- Commodore_1581 sameAs Q337278.
- Commodore_1581 wasDerivedFrom Commodore_1581?oldid=687123268.
- Commodore_1581 depiction Commodore_1581_01.jpg.
- Commodore_1581 isPrimaryTopicOf Commodore_1581.