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flat assembler > DOS > EMS64 - EMS 4.0 simulator

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CandyMan



Joined: 04 Sep 2009
Posts: 206
Location: film "CandyMan" directed through Bernard Rose
EMS64 - EMS 4.0 simulator
A device driver & program that emulates the Lotus/Intel/Microsoft Expanded Memory Specification, Version 4.0, in software, permitting extended memory above 4GB in x64 machines to be used as expanded memory. It uses unreal mode that cannot work in virtual 8086 mode. The XMS driver must be installed before EMS64.EXE because it uses XMS memory for handles, handle names and paging tables. Ideal for creating large RAMDISK if you have more than 4GB memory and 64-bit CPU and you use DOS.


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Filename: EMS64.7Z
Filesize: 47.19 KB
Downloaded: 21 Time(s)


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smaller is better


Last edited by CandyMan on 07 Sep 2016, 17:22; edited 1 time in total
Post 05 Sep 2016, 17:41
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6201
Location: Kraków, Poland
Fascinating! I knew that in principle XMS/EMS standards should be able to handle more than 4GB of memory because they use handle+lock/map mechanism, but this is the first time I see it actually done. I will not be able to try it, though, since I still use only the old 32-bit machine for DOS.
Post 05 Sep 2016, 18:16
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rugxulo



Joined: 09 Aug 2005
Posts: 2079
Location: Usono (aka, USA)

Tomasz Grysztar wrote:
Fascinating!



fascinating_587.gif (EDIT: don't you normally hate animated .GIFs distracting you? Me too.)

Razz Razz Razz (yes, it's the 50th anniversary today of Star Trek)


Tomasz Grysztar wrote:
I knew that in principle XMS/EMS standards should be able to handle more than 4GB of memory because they use handle+lock/map mechanism, but this is the first time I see it actually done.



No sources. Crying or Very sad Is this using PSE-36? (Haven't tried yet, will try later.)


Tomasz Grysztar wrote:
I will not be able to try it, though, since I still use only the old 32-bit machine for DOS.



Uh, you don't have any bootable DOS media? Or don't know how to make it??



Last edited by rugxulo on 20 Sep 2016, 04:27; edited 1 time in total
Post 09 Sep 2016, 02:15
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6201
Location: Kraków, Poland

rugxulo wrote:
Uh, you don't have any bootable DOS media? Or don't know how to make it??

I just don't see the point for myself of using any other machine for DOS when the old one runs perfectly.
Post 09 Sep 2016, 04:38
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rugxulo



Joined: 09 Aug 2005
Posts: 2079
Location: Usono (aka, USA)
I did briefly test this, and it seemed to work, but I need to test it further. I only tried my laptop, though, which "only" has 4 GB (on USB jump drive running slimmed FreeDOS; although I was already using 200 MB anyways for RAM disk via SHSURDRV).
Post 20 Sep 2016, 04:29
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CandyMan



Joined: 04 Sep 2009
Posts: 206
Location: film "CandyMan" directed through Bernard Rose
I have equal 4 GB of the memory, but 768 MB above 4 GB.

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smaller is better
Post 20 Sep 2016, 15:51
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rugxulo



Joined: 09 Aug 2005
Posts: 2079
Location: Usono (aka, USA)

Quote:

5,6c5,6
< Free XMS memory 3,505,899,520 bytes
< Largest free XMS block 3,505,899,520 bytes
---
> Free XMS memory 3,715,458,048 bytes
> Largest free XMS block 3,715,458,048 bytes
12c12
< 1 1642 209820672 0
---
> 1 1642 262144 1
17c17
< Conventional 636K 24K 612K
---
> Conventional 636K 94K 542K
20c20
< Extended (XMS) 3,628,797K 205,067K 3,423,730K
---
> Extended (XMS) 3,628,797K 420K 3,628,377K
22c22
< Total memory 3,629,821K 205,479K 3,424,342K
---
> Total memory 3,629,821K 902K 3,628,919K
24c24
< Total under 1 MB 636K 24K 612K
---
> Total under 1 MB 636K 94K 542K
26c26,29
< Largest executable program size 611K (626,096 bytes)
---
> Total Expanded (EMS) 512M (536,870,912 bytes)
> Free Expanded (EMS) 312M (327,155,712 bytes)
>
> Largest executable program size 539K (552,336 bytes)



So yeah, it saves me 200 MB of XMS (not that I need it!), but it uses 70 kb more conventional memory (which hopefully most DOS programs don't need). Either way, I just made a CONFIG.SYS menu to choose either method, for now.
Post 22 Sep 2016, 23:43
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