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Solidisk EFS (front)
Solidisk EFS (back)
The Solidisk EFS is a floppy/hard disc interface for the Electron. It plugs into a cartridge slot in the Plus 1 Expansion and can support 1 or 2 floppy discs and a Winchester hard disc. It is fitted with Solidisk's ADFS version 2.1 E which can support both Acorn DFS and ADFS formats. and has 16 K of sideways RAM. The Solidisk EFS uses a WD1770-PH disc controller. Note the EFS originally had a cover which protected the back of the board but it is missing.
Here is the Solidisk EFS Board, Before you start guide.
Here is the Solidisk ADFS Manual.
Here is the Solidisk ADFS, Before you start guide.