Packaging would have been one constraint, among others. It came in a 64-pin DIP, the largest available and broadly supported at a time. No room for 32 data a

Packaging would have been one constraint, among others. It came in a 64-pin DIP, the largest available and broadly supported at a time. No room for 32 data and 32 address pins + everything else they needed, without muxing which would have eliminated some of the benefits of the wider bus.