The Z80 and the 6502 (well, 8502 actually) CPUs share the same bus, and so there can only be one CPU running at one point in time. However afaik in CP/M and Z80 mode there are some I/O functions for the keyboard etc that halt the Z80, switch to the 8502, do what they do, and then switch back.
I'm not sure if you can somehow programmatically switch from the Z80 to the 8502 and back, though. I suspect not.
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Well, kind of.
The Z80 and the 6502 (well, 8502 actually) CPUs share the same bus, and so there can only be one CPU running at one point in time. However afaik in CP/M and Z80 mode there are some I/O functions for the keyboard etc that halt the Z80, switch to the 8502, do what they do, and then switch back.
I'm not sure if you can somehow programmatically switch from the Z80 to the 8502 and back, though. I suspect not.