From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Olson Subject: Re: 768k XT? Date: Tue, 10 Jun 2003 18:46:02 -0700 (PDT) Sender: linux-8086-owner@vger.kernel.org Message-ID: <20030610184345.P98615@agora.rdrop.com> References: Mime-Version: 1.0 Return-path: In-Reply-To: List-Id: Content-Type: TEXT/PLAIN; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Chad Page Cc: linux-8086@vger.kernel.org I could look for documentation I guess, but I'm not familar enough with DOS debug to know how to test for memory (I presume just writing to that address and seeing if there's anything there afterward). I have a VGA card in it now but could use anything I suppose. It's most likely that the memory is linear but that may not be the case. I was also wondering if there might be a register somewhere that turn the RAM on/off. Dan On Tue, 10 Jun 2003, Chad Page wrote: > > Use DOS debug to see if there's memory between segments a000 and > b000/b800, depending on the video type. It might also have an MMU of some > sort, but that would be rather unlikely. > > - Chad > > > On Tue, 10 Jun 2003, Dan Olson wrote: > > > Hopefully someone knows, I have a Samsung XT clone that has 3 banks of > > 256k chips, so that would mean a total of 768k or memory. The BIOS memory > > check reports 640k, so I'm wondering if there really is 768k available > > somehow, or if it was just cheaper to use 256k chips and leave a few k > > unused. Has anyone ever run into this before? Is anyone familar with any > > other boards that allowed the use of 256k parts in place of the 64k chips > > in order to add some upper memory? Does anyone have any DOS utilities or > > ELKS utilities that would test for upper RAM even though the BIOS says > > it's not there? Thanks. > > > > Dan > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-8086" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > >