can anyone think about the possibility of making a extended cpu cart with this design ?
- fpga-based z80 with a bank of 256Kb clocked as fast possible
- interface with the on-board cpu like advram
- ability for the old z80 to access in a memory mapped way the bank of 256Kb managed by the speedy z80 on the cart. (like advram does with vdp and z80).
the two cpu's should work in parallel.
A similar hw could be a fast coprocessor to the main cpu.
saving the knowledge of most msx z80 gurus
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