Mail Archives: opendos/2000/12/05/06:27:40
Yes, you are correct on this, but I did not want to elaborate, because the
discussion is already out of hand with a bunch nit-picking. I just wanted to
distinguish that it does use real memory and the memory does physically
exist in your computer. In fact virtual memory can be any kind of memory
storage, like bubble memory, a tape drive, or any other device that can
store binary data. Even though I did not state it, virtual memory is also
real physcial memory that stores binary data. But before I get stomped on
these devices like tape and hardrives can also be made to use for storing
analog data as well. In fact Tape drives, hard drives and other assorted
instruments used to store binary data are actually analog devices that store
the binary data in analog format. Raw binary data cannot be directly stored
on a tape drive or a hard drive, as it can in silicon, it must first be
converted and encoded. He also made some statement that it is not memory
that memory is made out of silicon by memory manufactures. He is also wrong
there as well. That is synthetic memory, real memory are the neuron cells in
your brain. We just make use of the physical properties of solid state
physics with silicon memory to store binary data. He has really just gone
too far. He will probably argue that and say that neurons are some
spcification and neurons don't really exist! Neuron: A specialized
impulse-conducting cell that is a functional unit of the nervous system. I
even have a diagram of a typical neuron.
I have had it with this nit-picking.
I will say one last thing about it. DR DOS's Task manager DOES NOT swap
tasks in memory. It does not shove memory through a tiny 64k window, you
switch from one virtual 8086 machine to another and no memory is being
swapped from one loaction to another except for such things such as your
video card which has it's own on board memory rewritten to view the new
window you are looking at on your CRT and other such types of memory if I
happen to leave one out. Task manager does not require any EMS memory, it
can however utilize it if you install it. I don't install EMS or use it in
normal operations of my computer. I did with DV, but no longer use DV. I
originally stated that I hated EMS memory, I still do and probably always
will. I never originally stated that XMS memory was better, in fact, I don't
even recall saying ANYTHING about XMS in my orginal statement.. Someone
else made that erroneous interpretation.
As far as I am concerned EMS should have died with the 8086 CPU and only
used with the 8086 CPU or other such restrctive CPUs. The EMS page frame
hogs valueable memory that I have much better uses for. I currently have
available on this system 622k RAM, and a 67K of contigous memory in UMB
that I can use for networking, loading TSR programs or whatever else I wich
to
put up into UMB. I CANNOT DO THIS WITH EMS, period. I have over 600K
avaiable for each and every task I wish to use with Task Manager and can use
all the extended memory I want with each task until I run out of RAM. I am
not
inited to a total of 32MB of memory above 1MB. I can use all 48MB of RAM
in my system, If I put more memory into it I can also use that too. I cannot
do
these things with DV and EMS memory. I am lucky to get a little over 500K
for
each app in DV and can only use 32 MB RAM.
Pat
----- Original Message -----
From: "Arkady V.Belousov" <ark AT belous DOT munic DOT msk DOT su>
To: <opendos AT delorie DOT com>
Sent: Monday, December 04, 2000 6:04 PM
Subject: Re: BASIC & EMS (was: Optimizing CONFIG.SYS...)
> X-Comment-To: Robert W Moss
>
> Hi!
>
> 4-δΕΛ-2000 15:42 domanspc AT juno DOT com (Robert W Moss) wrote to
opendos AT delorie DOT com:
>
> RM> Virtual memory is not "memory". It is the swap space on the
> RM> hard drive which is used to opn up space in real memory by
> RM> copying frequently used information out to the hard disk
> RM> where the program can call it up when needed.
>
> Not necessarily. I.e. I mean this is only _one_ way to implement
> virtual memory (VM). VM is a memory which exists as plain memory for
> application which works in this memory, but it should be mapped into some
> physical medium (RAM, disk, etc.). For example, some DOS extenders
implement
> swap files to increase available VM, other not.
>
> RM> It is slow because it is limited to the access speed of the hard
drive.
>
> _Only if_ part of VM, which must be accessed, currently swapped into
> disk. If all used VM already mapped into phisycal memory then there is no
> drawback, only advantages.
>
> Advantages: VM blocks can be moved in the physical memory to avoid
> memory fragmentaion. VM allow to isolate separate application and prevent
> one app memory contents corruption from other app.
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