[sdiy] SRAM like 5101

[jhaible at debitel.net]

Are there still SRAMs with separate data input and data output pins ?
The PS-3200 used 5101s (obsolete, and needed several of these because
of their small memory size). 

I'm looking for something like 512 x  8bit (or slightly larger), separate DI and DO pins.
I figure this must be a rather big package size (8 adress pins + 16 data pins alone),
so I'm not sure something like that even exists. (Maybe they cancelled thar separate
DI / DO interface when memories got bigger ?)

Any pointers ?

JH.