The SX-1 adds a number of features.

AT Keyboard

Serial port

Floppy port

Audio (Karaoke!)

 

Parallel

Hard Drive external

Disable - As it says.

 

 

 

RGB out (SCART)

The SX-1 is hard to get, and is more of a collectible then an actual usable upgrade. Look to spens about $300-$500 on a complete setup.

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