Commodore 1570

{{refimprove|date=August 2016}}

{{Infobox information appliance

| name = Commodore 1570

| title =

| image = Commodore 1570 01.JPG

| caption = Commodore 1570 floppy drive

| manufacturer = Commodore Business Machines, Inc.

| type = Floppy drive

| releasedate =

| price =

| discontinued =

| media = 5¼" floppy disk SS DD using GCR or MFM{{cite web |url=https://www.zimmers.net/cbmpics/d1571s.html

|title=Commodore 1571 Disk Drive : Coming up to par

|date=2015-03-20

|website=zimmers.net

|archive-url=https://web.archive.org/web/20160326051411/http://www.zimmers.net/cbmpics/d1571s.html

|archive-date=2016-03-26

|access-date=2016-04-27}}

| os = CBM DOS v3.0

| power =

| cpu = MOS 6502 @ {{nowrap|1-2 MHz}}, WD1770

| memory = 2 kB RAM 32 kB ROM

| storage = 170 kB (GCR) ; 200 kB (MFM)

| connectivity = Commodore proprietary serial IEEE-488 {{nowrap|5200 bytes/s}}

| dimensions =

| weight =

| compatibility= {{nowrap|Commodore 64,}} {{nowrap|Commodore 128}}

| predecessor = Commodore 1541

| successor = Commodore 1571

| related =

}}

The Commodore 1570 is a 5¼" floppy disk drive for the Commodore 128 home/personal computer. It is a single-sided, 170 kB version of the Commodore 1571, released as a stopgap measure when Commodore International was unable to provide sufficient quantities of 1571s due to a shortage of double-sided drive mechanisms (which were supplied by an outside manufacturer). Like the 1571, it can read and write both GCR and MFM disk formats.

The 1570 utilizes a 1571 logic board in a cream-colored original-1541-like case with a drive mechanism similar to the 1541's except that it was equipped with track-zero detection. Like the 1571, its built-in DOS provides a data burst mode for transferring data to the C128 computer at a faster speed than a 1541 can. Its ROM also contains some DOS bug fixes that didn't appear in the 1571 until much later. The 1570 can read and write all single-sided CP/M-format disks that the 1571 can access.

Although the 1570 is compatible with the Commodore 64, the C64 isn't capable of taking advantage of the drive's higher-speed operation, and when used with the C64 it is little more than a pricier 1541. Also, many early buyers of the C128 chose to temporarily make do with a 1541 drive, perhaps owned as part of a previous C64 setup, until the 1571 became more widely available.

The drive uses the CPU MOS 6502, floppy controller WD1770 or WD1772, I/O controllers 2x MOS Technology 6522 and 1x MOS Technology 6526.