@fluidlogic To clarify, my answer was tongue-in-cheek -- something that would only be obvious to someone already familiar with the C128.
To call the C128 a "Z80" computer is silly, but I couldn't resist making the joke when you defined your criteria as offloading graphics, sound and _other stuff_ to custom chips.
In terms of how much work the computer does per Z80 cycle, the C128 does indeed win. But at what cost?
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