hi, can anyone define an interface for a Z80 coprocessor, implementing at least integer multiply and divide, and better also the IEEE 754 standard for floating point operations?
Add those instructions to the Z80 base set should enhance the performance enough to support many algorithm.
This can be an idea for a real ZX Spectrum expansion device with an FPGA as coprocessor, or a coprocessor for MiSTer only ZX Spectrum core