You dont give much info, how is your config.sys?

hapen same without sound card in setup? NONE/NONE

theelf wrote on 2026-10-20, 05:47:

You dont give much info, how is uour config.sys? happe same without sound card in setup? NONE/NONE

Agreed. This looks like a pointer dereference error from your DPMI host, which is DOS/4GW under MS-DOS 6.22 but Windows95 handles that by itself (I believe). So the CPU accessed an invalid address and crashed. Without details on your memory configuration (EMM386, HIMEM) and sound/video drivers loaded (you wrote SBPro2.0 which doesn't require a driver), it's almost impossible to tell.

Things to try:

• Clean boot (F5 during startup)
• No EMM386
• Try with sound disabled in Duke3D config

And post your `CONFIG.SYS` and `AUTOEXEC.BAT` here 😀

theelf wrote on 2026-10-20, 05:47:

You dont give much info, how is your config.sys?

hapen same without sound card in setup? NONE/NONE

With or without the card I get this error. Here is the Config.sys

daanmsvl wrote on 2026-10-20, 10:05:

Agreed. This looks like a pointer dereference error from your DPMI host, which is DOS/4GW under MS-DOS 6.22 but Windows95 handle […]
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theelf wrote on 2026-10-20, 05:47:

You dont give much info, how is uour config.sys? happe same without sound card in setup? NONE/NONE

Agreed. This looks like a pointer dereference error from your DPMI host, which is DOS/4GW under MS-DOS 6.22 but Windows95 handles that by itself (I believe). So the CPU accessed an invalid address and crashed. Without details on your memory configuration (EMM386, HIMEM) and sound/video drivers loaded (you wrote SBPro2.0 which doesn't require a driver), it's almost impossible to tell.

Things to try:

• Clean boot (F5 during startup)
• No EMM386
• Try with sound disabled in Duke3D config

And post your `CONFIG.SYS` and `AUTOEXEC.BAT` here 😀

And Autoexec

It's a mess. But I will def try those options. Sorry I didn't include that information but the help is greatly appreciated.

I think leaving off SMARTDRV could help. Duke3D's help advises against loading SMARTDRV as it has its own caching system. The only exception for it is if you've got a FAT32 partition (which a DOS 6.22 system can't have)

So I Have removed EMM386, HIMEM and SMARTDRV, and now I am getting a red screen.

So I Have removed EMM386, HIMEM and SMARTDRV, and now I am getting a red screen.

Mystery to me, but smartdrv is in your configuration twice: autoexec, and config. My take: Minimal boot (only himem), no EMM386, leave the rest out and retry?
Could be a hardware problem though...

daanmsvl wrote on Yesterday, 19:57:

Mystery to me, but smartdrv is in your configuration twice: autoexec, and config. My take: Minimal boot (only himem), no EMM386, leave the rest out and retry?
Could be a hardware problem though...

I will try that, also may do a clean install of DOS 6.22 without using the Phils Computer Lab DOS starter kit, and go from there. It's very strange. I've only been able to get this game to run when I had windows 95 and windows 3.11 installed, never in DOS. I appreciate the help more than you all know. 🤘

Hmmm, how much RAM does this system have? I know it will use virtual memory run under windows, but if you've got only 4MB total, or left because something is loaded, then it won't run. Can run on a clean boot 6MB despite saying 8MB minimum.

BitWrangler wrote on Today, 02:27:

Hmmm, how much RAM does this system have? I know it will use virtual memory run under windows, but if you've got only 4MB total, or left because something is loaded, then it won't run. Can run on a clean boot 6MB despite saying 8MB minimum.

32 MB

Let's go back to square 1.
Run Memtest.

If that passes, we can move to square 2.

A RAM error is likely. Every OS handles memory management differently, that would explain the results you're seeing. I'd recommend a full memory test as well.

Right, DOS does bottom up, Windows does top down, with the exception that the MMU has a say and presents fastest memory first.