Commodore Single Disk Drive, Technical Manual, Model 1540/1541, P/N 990445. There is no date, but it looks to be about 1984. This is an early version covering only the 1540 and 1541, with an update that covers the 1541B.
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The Commodore brandname and the chickenhead logo are property of Commodore International BV, a Tulip company.
