Where have you gone???

Hello, Mikka_A The question was quite simple. Consider introducing new memory addressing standard. Additional registers. How many digits, how many pieces, what addresses, what to do with old registers, or just do memory manager as on ATM (any page of RAM in any quarter). Or else what. Regarding DRAM vs SRAM; Now; I'm designing a ZX clone (based on the principle Sprinter). Memory SRAM 2*512KB-15ns (2 pieces 180Ru), scanning immediately VGA 75Hz (although I don’t deny that there will be support for an RGB PAL encoder (fully programmable timings). So, I would like to organize something with large amount of memory (NOT SRAM), at least up to 16 MB...