Thanks to Deep Tone Music for the info: Essentially a miniature DX7, the Yamaha DX21 is a digital controlled bi-timbral programmable digital FM synthesizer with a four operator synth voice generator which was released in 1985. It uses sine wave-based frequency modulation (FM) synthesis. It has two FM tone generators and a 32-voice random-access memory (RAM), 32 user voices and 128 read-only memory (ROM) factory preset sounds. As a programmable synth, it enables users to create their own unique synthesized tones and sound effects by using the algorithms and oscillators.
Given a basic test prior to listing, screen is a little sunburned but is still visible, factory 240v model with an Australian plug.
Shipping: Domestic - We offer a courier service Australia wide on our guitars (and keyboards)! All prices include insurance for loss/damage along with industrial packaging to ensure your guitar arrives safely.
International - We ship worldwide almost as often as we ship domestically. We use EMS or UPS express services depending on the destination. 
Returns:  We only offer returns on faulty or broken items, not if you change your mind. All guitars are thoroughly tested here and we'll do our best to list any known troubles in the condition section above.  

Click & Collect and local pickup available soon from our new secret location in Gladesville, Sydney.