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- Message-ID: <9301062038.AA29656@lobby.ti.com>
- Newsgroups: bit.listserv.sas-l
- Date: Wed, 6 Jan 1993 14:38:39 CST
- Reply-To: "R. Snyder" <rsnyder@LOBBY.TI.COM>
- Sender: "SAS(r) Discussion" <SAS-L@UGA.BITNET>
- From: "R. Snyder" <rsnyder@LOBBY.TI.COM>
- Subject: Re: MS-DOS 5.0 and Expanded Memory
- Comments: To: 75046.1627@compuserve.com
- Comments: cc: sas-l@uga.cc.uga.edu
- In-Reply-To: <199301061630.AA22108@lobby.ti.com>; from "Michael Davis" at Jan
- 6, 93 11:23 am
- Lines: 61
-
- SUBJECT: 6.04 and exPANDed memory.
- SUMMARY: I talked to SI Tech Support.
- REL/PLTF: 6.07/HP300
- E-ADDR: rsnyder@lobby.ti.com
- NAME: Bob Snyder
- COMPANY: Texas Instruments, Sherman, TX
- PHONE: (903) 868-5799
- FAX: (903) 868-7240
-
- Michael Davis (correctly) says:
-
- > You also asked about expanded memory under release 6.04. I don't
- > know the theorectical limit but there is very little benefit to
- > going beyond 2MB of expanded memory for this release.
- >
- > If I were you, I would not invest any more money on this computer
- > system or purchase the MS-DOS upgrade. Sooner or later, the
- > 6.04 release will be "orphaned" and you will have to choose to run
- > SAS under Windows, OS/2 or some other platform. At that point, you
- > will have to get a new machine and the operating system will be part
- > of the deal.
-
- Instead of seeing how far I could shove my foot into my mouth I decided to
- get with SI Tech Support.
-
- Their wisdom is that exPANDed is a kludge and that SAS's use of it is also
- a kludge. Roughly 60% of the 6.04 SAS program modules can be loaded into
- expanded memory. Some modules are non-deletable once loaded and some will
- be purged when not needed. The only way you would need more than 2M of
- exPANDed memory is if you run enough diverse applications in one session to
- load 2M of non-deletable code. SAS does not put any data into expanded
- memory. Data is put only in conventional memory. DOS 5.0 helps here.
-
- SAS provides two commands for memory management, cde and cdm. cde executed
- from the SAS command line will tell you how much conventional memory is
- available. cdm will list the modules loaded into expanded memory, their
- starting addresses, and if they're non-deletable.
-
- Tech support gave me two ideas for making use of extended/expanded memory
- beyound the 2M of expanded used by SAS directly. One is to make a RAM disk
- and use a batch file to load the modules that cdm shows you use
- the most onto the RAM disk. The path commands in the config.sas
- file will have to be modified to have SAS look on the RAM disk first for
- this to be effective. You may also put the SASWORK directory on RAM disk
- which would speed up access to tempory data. The hazard of placing the
- SASWORK directory on RAM disk is that running out of space causes a complete
- system crash. Some folks use both methods.
-
- Another suggestion is to use a product like QEMM which can allow you to
- borrow from video memory. This creates more conventional memory just as
- DOS 5.0 does by relocating part of the kernal.
-
- In general, I agree with Michael, the AT is becomming obsolete and SAS 6.04
- is a stagnant product which SI will not upgrade for the new technologies.
- The Windows solution, just as OS/2 and UNIX, is expensive but is the way that
- the user community is going. I would recommend putting your energies into
- justifying a new system. There is little that can be done to improve the
- old significantly.
-
- Regards,
- Bob
-