CASIO MT-640 - YouTube
Casiotone MT-640 (Demo music - 1988 - NEC D938g soundchip) Duke Ellington - "Take the A Train" - YouTube
File:Casiotone MT-65.jpg - Wikimedia Commons
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Casio MT-640 - Catawiki
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CASIO MT-640 ALIMENTATORE TASTIERA ADATTATORE RICAMBIO UK 9V 712221881978 | eBay
MT-640 Questions - Classic Casio Discussion - Casio Music Forums
Demonstration of the Casio MT640 Keyboard - YouTube
AC Power Adapter for CASIO MT-640 MT-600 MT-540 MT-500 Keyboard Cord Mains PSU | eBay
MT-240 - Casio MT-240 - Audiofanzine
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Casio CT-640 Midi Music Keyboard - 61 Key Piano Casiotone - 1988 - YouTube
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CASIO MT-640 ALIMENTATORE TASTIERA ADATTATORE RICAMBIO UK 9V 712221881978 | eBay
