Path: utzoo!utgpu!water!watmath!clyde!rutgers!rochester!udel!burdvax!sdcrdcf!trwrb!cadovax!mitchell
From: mitchell@cadovax.UUCP (Mitchell Lerner)
Newsgroups: comp.unix.xenix
Subject: Extended memory and ATs...
Summary: Wait states and memory for Xenix.
Message-ID: <1923@cadovax.UUCP>
Date: 11 Feb 88 17:44:04 GMT
Organization: Contel Business Systems, Torrance, CA
Lines: 26
Posted: Thu Feb 11 09:44:04 1988


O.K.

Whats the real story with extended memory on an AT running Xenix.

I was under the impression that if you got a board with anything
less than 120ns chips on it, that it wouldn't run at 10mhz.

I am finding that at 10mhz, every board that I have investigated, 
inforces at least 1 wait state.  If there is a wait state introduced
at 10mhz, then what would it matter if you used 150ns chips or 120ns chips?
I know that 150s cannot keep up with the bus at 10mhz, but it also
looks like 120ns chips cannot either because most of the boards
seem to employ a wait state at that speed.

Now the board that uses 150ns chips that I am talking about (the BOCA-RAM 20 
AT) is garenteed(sp?) to run at 6, 8, 10, 16 and 20mhz (I guess that they 
have a wait state generator that keeps adding wait states as the clock 
speed goes up).

Am I really off on this one or what?  
-- 
Mitchell Lerner
UUCP:  {ucbvax,ihnp4,decvax}!trwrb!cadovax!mitchell

"When I fight with my mind, my mind always wins" - Ben Hummel