How to get DOS to see 128MB ram?
Scatliff
has 128MB ram....(it only sees 64MB)...please help. The Computer itself
loads the 128MB...but once MS-dos loads it only can access 65. Does
PC-dos allow you to see beyond the 65MB barrier?
--
0o Sean Pearson
(
-
Better Off
: If someone here knows how to get MS-DOS (6.22) to understand the computer
: loads the 128MB...but once MS-dos loads it only can access 65. Does
: PC-dos allow you to see beyond the 65MB barrier?
With that much RAM why run DOS?? Why not, say. Linux or OS/2??
John Guynn
>If you have a 286...the most RAM it can use is at least 32 Mb,
>provided you're using a memory card with EMS drivers.
Actually with a 286 or 386SX the most physical extended memory you can address
is 16 MB.
>If you have a 386...the most RAM it can use is 16 Mb.
Last time I checked all 386DX and up had 32 address lines. That means in
theory you could address 4000GB of physical memory (yes that's 4 Terabytes).
>If you have an early 486...the most RAM it can use is 32 Mb.
See above
>If you have a latter 486 and up...the most RAM it can use varies
>between 32 and 64 Mb...Sometimes even more, depending on the
>motherboard.
See above
>All IBM AT's and compatible PC's require that you set up your BIOS
>with the proper RAM value by using either BIOS-setup or a diagnostic
>software utility. DOS has nothing to do with how much memory is
>actually recognized by the computer. If there is a barrier, it's the
>maximum amount of RAM a motherboard is able to support, and not DOS.
There is a barrier in the memory managers. I think Qemm 7.0x has a limit of
85 or 86 Meg. We ran into this with some of the machines I work with
have 148 Meg and dos not see it all. Our Netware 4.10 server with 128 Meg
found all the memory just fine. Also NT, Linux, and OS/2 should all talk to
128 Meg with a little tweeking.
Up until 72 pin Simms came out, it was usually a motherboard limitation
(usually 64 Meg was max a board could hold). Now it is possible to populate a
board with 1 Gig worth of 72 pin Simms.
John Guynn j...@univel.telescan.com
Network Admin Telescan Inc.
"If you're killed, you've lost a very important part of your life."
--Brooke Shields
Ment
: If someone here knows how to get MS-DOS (6.22) to understand the computer
: has 128MB ram....(it only sees 64MB)...please help. The Computer itself
: loads the 128MB...but once MS-dos loads it only can access 65. Does
: PC-dos allow you to see beyond the 65MB barrier?
:
Send me the remaining 64MB....problem solved! <G>
--
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Ment __ __ ____ ___ ___ ____
me...@primenet.com /__)/__) / / / / /_ /\ / /_ /
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Sean Pearson (maybe)
> DOS relies on the BIOS to tell it how much memory is available.
> The bios interface for this is limited to 64Meg because it describes
> the of memory in units of 1K, and the field is 16bits.
>
> I believe that Windows can use more than 64Meg: if dos/bios reports
> 64Meg, it will go out and look for more.
>
> --
> john nelson (j...@genrad.com)
>
Guess what...quemm 7.5 solves the problem. Himem & Emm386 can't address
past 64MB, but Quarterdeck can.
Matt Grey
KL> I need a batch file that would allow me to switch from drive C: to
KL> another drive and directory D:\GAMES. Also I would like an option
KL> to switch to any directory in D:\GAMES like HERETIC.
KL> I've got part of it figured out.
KL> H.BAT
KL> -----
KL> @echo off
KL> D:
KL> cd GAMES
KL>
KL> That's easy enough, but I would like to type 'C:\H.BAT HERETIC' to get
KL> to D:\GAMES\HERETIC. So how is that done?
Well, I think I've got your problem solved, friend. I made a file
long ago called RUN.BAT, and once you get it started, it grows like a
Chia Pet in radioactive terra cotta.
goes like this
RUN.BAT
@echo off
if %1==xxxx goto XXXX
if %1==yyyy goto YYYY
"This program is not set up to run %1"
:XXXX
cd \
D:
cd games
cd heretic
heretic
goto end
:YYYY
cd\
D:
cd games
cd doom
doom
goto end
:end
cd \
C:
The syntax for typing this in is 'run [filename]', just like an old Apple IIe.
Lotsa fun.
Hope this helps!
Matt
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