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Polebrook Computer Services floppy disc controller
The Polebrook Computer Services floppy disc controller uses an Intel 8271 controller chip. The floppy disc cable connects to the connector in the middle on the left. This Eurocard is installed in the Busicomputers Prophet 3, an OEM Acorn Atom. It is a standard Eurocard so should be useable in any Atom or System computer.
Here is a Hi-Res picture of the Polebrook fdc .