Solidisk 1770 Disc Interface

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Solidisk 1770 Disc Interface issue 2 (top)

Solidisk 1770 Disc Interface issue 2 (bottom) 

The Solidisk 1770 Disc Interface is a double density disc controller using a Western Digital WD1770 disc controller. It is mounted on a small daughter board and plugs into the 8271 socket on the BBC motherboard. It comes with the Solidisk DFS 2.0 ROM plugs into one of the sideways ROM sockets.
 
A Solidisk advertisement (Acorn User Dec 1985) says:
"The Solidisk 1770 DFS includes a built-in disc formatted and verifier, automatic 40/80 track switching, programmable disc speed and is upgradable to the Solidisc ADFS. it also has some advantages over the the Acorn 1770 system:

• 60% more storage capacity in double density DFS, giving you up to 640K on a double sided 80 track disk
• Better emulation of the 8271: some protected games will not run on the Acorn 1770.
• .Built-in useful disk utilities such as TAPEDISC, MZAP, DZAP (disc sector editor), RECOVER, RESTORE etc. "

In September 1985 Acorn User published a review titled "On the Double ".

Here is the Solidisk Disc Filing System Manual .