DOS ain't dead

more EMS support in XP (Announce)

posted by nidud , Norway, 24.12.2012, 10:17

> My curiosity lead me to try the driver. I saw that mem really repports
> 256MB EMS but it also caused problems to existing programs. When I run DN
> OpenSOurce 7.2.16 it crashed:

I actually use DN to test if the driver is installed, but that have to be a different version.

> (it tells that NTVDM CPU got invalid instruction, Choose close/skip)
> So I quickly removed the driver from config.nt

For testing you may use a new shortcut, and set the CONFIG.NT to a local directory to avoid messing up the global settings.


I downloaded version 6.4.0 (dn640r.rar), and that crashes.
I looked at the code, and I think the size is a problem:

   if EMSFound then
    asm
     mov ah, 42h
     int 67h
     mov cl, 4
     shl dx, cl
     mov EMSSize, dx


If the total size is 256M dx will be 4000h
I uploaded a new version (dzemm101.zip), and now the total size is set to 32M (dx = 0800h).

I made some changes to load DN, but the actual problem is still there, so I need to do some more testing..

Complete thread:

• more EMS support in XP - nidud, 23.12.2012, 13:50 (Announce)
  • more EMS support in XP - RayeR, 23.12.2012, 18:41
    • more EMS support in XP - RayeR, 24.12.2012, 00:08
      • more EMS support in XP - nidud, 24.12.2012, 10:17
        • more EMS support in XP - RayeR, 25.12.2012, 02:48
          • more EMS support in XP - nidud, 28.12.2012, 21:29
            • more EMS support in XP - RayeR, 29.12.2012, 01:34