[sdiy] using 6264 Ram

[Paul Schreiber]

a) The Axx lines are address lines (that "memory location" in the RAM you 
are looking at). These are inputs only.

b) the is probably a /CS (Chip Select, active LOW) that unless this pin is 
at logic ground, the chip ignores all signals

c) there will be 8 I/O lines, or DATA lines. These are *bi-directional*, 
depending if you are Writing data to the chip (inputs) or reading data from 
the chip (outputs).

d) There is probably a /WE (Write Enable, active low) or sometimes it's 
called R/~W (Read/not WRITE) which is an input that tells the chip if you 
want to READ to WRITE

Paul S.