Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!cmcl2!rutgers!rochester!udel!farber From: farber@udel.EDU (Dave Farber) Newsgroups: comp.sys.ibm.pc Subject: Re: Expanding Intel 386 board to 640K for DOS Message-ID: <495@louie.udel.EDU> Date: Fri, 11-Sep-87 08:13:06 EDT Article-I.D.: louie.495 Posted: Fri Sep 11 08:13:06 1987 Date-Received: Sat, 12-Sep-87 17:34:26 EDT References: <8020007@hp-lsd.HP.COM> Sender: usenet@udel.EDU Reply-To: farber@udel.EDU (Dave Farber) Organization: University of Delaware Lines: 59 In article <8020007@hp-lsd.HP.COM> davek@hp-lsd.HP.COM (Dave Kumpf) writes: >The latest issue of PC Magazine contains test reports on several '386 machines. >They tested several which are based on the Intel motherboard, including Corvus, >Kaypro, and others. > >Here's my question -- the text implied that it is extraordinarily difficult >(or impossible) to use more than 512K for DOS using the Intel motherboard, >even if you have the Intel memory expansion cards. What's the scoop? Anyone >out there have any experiences with expanding DOS to 640K on the Intel >board? > >Dave Kumpf -- hp-lsd!davek The problem is that the 32 bit memory board from Intel bases itself at the 1 meg address boundary. So we have a 32 bit 512 on the "planar" and lots of memory above 1 meg. How to fill? two ways, one get a 128k memory board (hopefully 16 bit) or better yet do what I did and find a memory board from an AT (that I had arround) that allows split addressing of its memory so you can fill the 128 k and then put the rest up ABOVE the Intel boards. Unfortunately you can NOT set the base memory on the 32 bit memory boards from Intel so they stack at 1, 3 etc. I will look whose board I used NOT all allow you to do this even though they say they support split memory. Dave ps WHY oh WHY did Intel do that!! pps BTW if you use SCO Xenix 386 it makes no difference anyway ============================================================= David J. Farber University of Delaware Professor of Electrical Engineering and of Computer Science University of Delaware Department of Electrical Engineering Newark, De 19716 Office: 302-451-1163; Arpanet/CSNet: farber@udel.edu Dialcom(nsf): D.Farber Compuserve: 76010,104 Fax: 1-818-440-1742 Voice Mail and Mobile Tel: 1-302-740-1198 ____________________________________________________________ Home RD 1 Box 279 Landenberg, Pa 19350 Home Phone: 215-274-8292 =============================================================