Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-ses!hpcea!hpldsla!djw
From: djw@hpldsla.HP.COM
Newsgroups: comp.sys.ibm.pc
Subject: Mixing DRAM speeds
Message-ID: <2340003@hpldsla.HP.COM>
Date: 20 Mar 90 18:21:31 GMT
Lines: 29

A friend of mine just added a 2 meg bank of 1megx1bit  80ns DRAM
to his 80286, NEAT chip set clone.  The  computer  already had a
1/2 meg bank of 256kx1bit 120ns DRAM.

He configured the memory controller (is that right??) for 120ns
memory.

So, all  should  work  fine, and he should  get 2.5 megs  with a
speed of 120ns - right?

Wrong, it just hangs, and won't boot.

What's the problem here?  Is it something to do with the refresh
times?  That is,  maybe  the  80ns  drams  need to be  refreshed
faster than 120ns setting will do?

He's  just  going to  continue  with 2 megs for now, but this is
puzzling,  and it would be nice to use the  other  1/2 meg  (the
extra speed is not as important).

thanks for your advice,

David Williams
___________________________________________________________________
Hewlett-Packard Scientific Instruments Division (SID) /\___________
1601 California Ave, Palo Alto, CA, USA. /\______________/\________
phone: 415 857 6100. FAX: 415 852 8011  //\\____________|__________
HP-UX Mail:  djw@hpldsla.hp.com         /  \____/\____/\___________
HPdesk:     (djw)hpldsla/HP1900/00     /\____________/  \__________