On the 1541-II are two DIP switches which change the device number to any number between 8 and 11 (the default is 8 on all 1541s).
#C64 INITIALIZE DRIVE SERIAL#
On the rear of the case are two identical serial ports, the power switch and power connector. The LED colors were swapped on the 1541-II and some later models. When the red LED is flashing, it means that an error has occurred. On the front of the case are two LEDs - a green power LED and a red one that lights when the drive is active and is controlled by the drive's firmware. However, it will be slower than the 1570/ 1571 on the C128, and also slower than the 1551 on the C16/C116/Plus-4 due to the 1541's slow transfer speed, so it is mainly recommended for the C64. It is also compatible with all later Commodore 8-bit home computer models: the C128/ D/ DCR, C16/ 116 and Plus/4. The successor of the VIC-1540 (which can only be used with the VIC-20), the 1541 was intended for use with the C64, but is also backwards compatible with the VIC-20. The most notable of these are the 1541C and 1541-II, introduced in 19 respectively. Because of the C64's long production run, the 1541 underwent a number of revisions during its life. It is connected to the serial bus via a 6-pin DIN cable to the Commodore 64. All 1541 models use a single density drive mechanism with a single read/write head.
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The Commodore 1541 or CBM-1541 (early models: VIC-1541 or - Germany only - VC-1541) is a floppy disk drive which uses 5.25" disks.