External Drive Interface (on the interface named as "SDI" and as "SAM external drive interface" on the instructions)

MGT

One of the original peripherals produced by MGT it allowed users with a ZX Spectrum and PLUS-D/DISCiPLE interfaces (previous MGT products) to re-use their Shugart 400 type 5.25” or 3.5” disc drives with the Coupé without having to purchase the internal units.

It also featured the same parallel interface as the Comms Interface allowing the users’ printers to be accomodated.

It came with instructions and an “SDI loader” on cassette.

Was re-launced and sold by West Coast Computers as the XDI (eXternal Drive Interface).