(photo taken from eBay, showing my specimen)
This brown keyboard is simply the midsize version of
Casio PT-80. Thus the main voice is still monophonic despite bigger keys. The specimen I bought even came with the same
ROM-Pack RO-551.
different main features:
- 32 midsize keys
- better speaker (without disturbing resonance)
- different CPU= "HD61703A01, 5B 33" (80 pin SMD)
notes:
Very unusual is that the MT-18 contains a different CPU despite the behaviour is identical with the
PT-80. Thus I guess that the same CPU core was only re- released in a different package or manufacturing process for technical reasons, while the internal circuit stayed the same. Also the PCB layout and material looks very different. Despite it worked well, I found in my Casio MT-18 an exploded electrolytic capacitor (which I replaced).
