Acorn Computers - Electron Plus 3
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04-ALA13-0100007
 
A disk drive option was provided by the Plus 3 expansion unit. This bolted on to the rear of the Electron and had a 3½ inch disk drive and a connection for a second one.

The disk drive needed to be informed when a disk was inserted, using the *MOUNT and *LIB commands. Disk handling routines such as Format were accessed from the Welcome disk.

A Plus 1 extension unit can be added to the rear of the Plus 1 (but not the other way round), giving joystick and printer capabilities.
 
 
The Plus 3 bolts securely to the back of the computer with the disk drive on the right-hand side.
 
 
With the Plus-3 in place, a 21 volt power supply is supplied, the Electron's own is not powerful enough.
 
 
 
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