7 May
2001
7 May
'01
8:52 a.m.
I thought I
was being clever when I bought a cheap DEC 3000/400 (I think)
for the RAM, but it turns out the 400 had 60ns RAM, while my 900 required
70ns.
Why would any machine object to RAM that was faster than it needed?
(assuming the same type of RAM chips, same pinouts on the modules, etc).
The access time is generally a worst-case anyway, and under some
circumstances the data will be available sooner that you'd expect. It's
just that you design the memory controller based on the quoted access
time, since then you _know_ the data will be valid when you expect it.
-tony