datasheets for 82S21 - Signetics 32x2 SRAM?

[Tony Duell]

> 
> 
> Tony Duell wrote:
> >
> >Here's the pinout. I have no idea what some of the signals are for (does 
> >it, for example, have separate write-enable inputs for the 2 bits?), but 
> >it may be better than nothing.
> 
> Thanks - I know the pinout.  I think this ram would allow some sort of
> simultaneous read/write (not dual port, just overlapped) but I don't
> know how it works.

Quite likely, although the control signals look unconventional. I would 
guess you can apply a 5 bit address and read the contents of that 
location one the DO lines. You may have to pulse the strobe line, or 
something like that. Presumably you can also provide new data on the DI 
lines and write it into that location.

What device uses this RAM, and what are the control pins conencted to?

-tony