For 1985, I'd think that you'd also have to imagine that DRAM was cheaper than what it really was.
RISC and especially MMU with paging increase memory requirements. For comparison, the first Amiga was designed for 128K, got 256K. Linux/M68K with MMU on the Amiga required 4MB to be usable.
RISC and especially MMU with paging increase memory requirements. For comparison, the first Amiga was designed for 128K, got 256K. Linux/M68K with MMU on the Amiga required 4MB to be usable.