PDA

View Full Version : What is expanded memory?

jes
11-01-2002, 10:26 PM
What is expanded memory?
Budfred
11-02-2002, 02:40 AM
Try here:

http://www.webopedia.com/TERM/E/expanded_memory.html

Budfred
jes
11-03-2002, 08:39 PM
Where can I find the graphical demontration of that? (with the 640K base memory and then the 384 Upper...)
j_sayles
11-03-2002, 10:05 PM
http://www.geocities.com/joshua_sayles2001/extendedmemory.html


not sure if this what you wanted
Budfred
11-03-2002, 10:29 PM
I am not sure what you are asking. If you mean a graph representing the configuration of expanded memory, I would suggest doing a Google search and checking some of the references there.

http://www.google.com/

Budfred
Paul Komski
11-04-2002, 09:30 PM
No graphs - but a good description of Logical Memory at our own http://www.pcguide.com/ref/ram/logic-i.htm
jes
11-04-2002, 11:03 PM
I'm having trouble grasping this idea. Is expanded memory part of upper memory?
Budfred
11-04-2002, 11:11 PM
Unless you are looking at an old machine, it is unlikely that you will have to deal with expanded memory, it just isn't used anymore. Check out the link in Paul Komski's post if you need to figure it out. It has a pretty good explanation.

Honestly, I had to deal with expanded memory years ago and I never got it then and still don't get it now.

Budfred
dilsburger
11-05-2002, 07:23 AM
I'm having trouble grasping this idea. Is expanded memory part of upper memory?

Reaching way back in my "own memory" here....:) This is how I remember it: If someone finds this flawed a little I'm not surprised.

On those old 8088 type machines you had to use a tool (QEMM comes to mind) that would allow you to configure blocks of upper memory or expanded memory addresses above the "real memory" 64KB line contiguously. This was a limitation of the old DOS versions.

By setting your upper memory blocks this way programs like Framework, DBase and Lotus 1-2-3 could run spreadsheets and perform database operations by accessing upper memory and avoided running out of memory as fast.

The problem back then was the software resource demand on the PC was always way ahead of the hardware technology for running business applications we take for granted now such as Word or Excel.

That's a bottom line explanation and as Budfred said, it's just not something you have to deal with anymore.
jes
11-05-2002, 11:57 AM
I am just wondering where the expanded memory fits in the visual interpretation where base is 640 K, upper is the next 348 K, high is the next 64 K and extended is the rest up to a max total of 4 Gb.
dilsburger
11-05-2002, 12:12 PM
Maybe THIS (http://www.eeng.brad.ac.uk/help/.dos/.expextmem.html) will help? There is a decent diagram near the end of the link that seems to be what you are looking for.
jes
11-05-2002, 02:59 PM
Essentially, that is what I am looking for. So expanded memory can be anywhere? Is it always a 16 K page?
dilsburger
11-05-2002, 08:48 PM
I do remember it was always divided in 16K page frames, and I suppose you can say it can be anywhere. But beyond that you've pretty much taxed my little bit of knowledge of it and also took me back a few years.... I never worked extensively with it and it's not a very easy thing to grasp. I just had to get applications loaded into "hi memory" and run away fast... :D :D
jes
11-06-2002, 03:11 PM
That's probably all that I will need to know about it. Thanks everyone,