The DX7 was 6 operators, and the module in the CX5M (I had one) was 4 operators, like the DX21. It used the YM2151 sound chip, which was also present in a number of video games.
This was an awesome computer, very fun to play with.
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Aha, thank you for jogging me grey matter, I had one as well (got one with a couple of friends and formed a band - one gig wonder). Had a TR707 as well, fun times and great intro into music. Did enjoy the CX5M immensely, though went out of my way to avoid any preset sound. Once you've owned a synth, you just recognise all the presets in all the songs, but was easier back then unlike todays sample world.
I did prefer the bass sounds on the Casio Phase Distortion synths though over the FM options as sounded richer (at least for me).