HJW2@PSUVM.BITNET (03/03/89)
I have an IBM AT compatible with 512K on board. Recently I installed another 512K to bring it up to 1 Meg. and found out it a waste for anything over 640K. I am using DOS 3.3 which only recognizes 640K RAM. The only thing I can do is to create a ram drive which is useless to me. I know PS/2 50s can address 1 Meg. without any problem. Is there a way to 'tell' the system to use the extra 384K memory as normal? I am using the Microsoft Windows/286 and know it can't be so powerful if I have only 640K RAM. Any comments on this problem would be appreciated. I will post the solutions if there are enough responses. Please e-mail me or post in the net. Thanks! Hawjan HJW2@PSUVM
HDK@PSUVM.BITNET (H. D. Knoble) (03/10/89)
There is two ways for you to utilize the 1M-640K as RAM:
1) Install a LIM (Lotus-Intel-MicroSoft) board. This allows DOS to access
memory above 640K by a remapping of addresses by an algorithm called
the LIM standard. PC Magazine has several ads discounting such boards.
This algorithm is sometimes called the EMS (Expanded Memory Simulator).
In order for it to be useful, a software product (like Kedit) must
support EMS memory. Most products by Lotus and MicroSoft do. But
the board does not allow general programs to address more than 640K.
2) There is a software product that will effect 1) above, called
EMSimulator. This is available for $50. from:
Orders Only: Information/Orders
(800)821-5226 Ext. 435 (808)737-3809
Kam & Associates, Inc.
3615 Harding Ave. Suite 401
Honolulu, Hawaii 96816
There is an evaluation copy of EMSIM here that you could come and
copy. It's good for 1M; the production version is good for 8M if
you have that much real storage. The disadvantages of the software
product are that it takes 70K below the 640K line to run; it is
software so it will use CPU (not that noticable on a PS/2 50 using
Kedit); and there are conflicts using a RAM disk (VDISK.SYS) and
EMSIM together - i.e. directories and files get randomly changed.